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>
23 #include <linux/aio.h>
25 #include <linux/swap.h>
26 #include <linux/slab.h>
27 #include <linux/sysctl.h>
28 #include <linux/bitmap.h>
29 #include <linux/signal.h>
30 #include <linux/printk.h>
31 #include <linux/proc_fs.h>
32 #include <linux/security.h>
33 #include <linux/ctype.h>
34 #include <linux/kmemleak.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/sched/coredump.h>
67 #include <linux/kexec.h>
68 #include <linux/bpf.h>
69 #include <linux/mount.h>
70 #include <linux/userfaultfd_k.h>
71 #include <linux/coredump.h>
72 #include <linux/latencytop.h>
73 #include <linux/pid.h>
75 #include "../lib/kstrtox.h"
77 #include <linux/uaccess.h>
78 #include <asm/processor.h>
82 #include <asm/stacktrace.h>
86 #include <asm/setup.h>
88 #ifdef CONFIG_BSD_PROCESS_ACCT
89 #include <linux/acct.h>
91 #ifdef CONFIG_RT_MUTEXES
92 #include <linux/rtmutex.h>
94 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
95 #include <linux/lockdep.h>
97 #ifdef CONFIG_CHR_DEV_SG
100 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
101 #include <linux/stackleak.h>
103 #ifdef CONFIG_LOCKUP_DETECTOR
104 #include <linux/nmi.h>
107 #if defined(CONFIG_SYSCTL)
109 /* Constants used for minimum and maximum */
110 #ifdef CONFIG_LOCKUP_DETECTOR
111 static int sixty = 60;
114 static int __maybe_unused neg_one = -1;
115 static int __maybe_unused two = 2;
116 static int __maybe_unused four = 4;
117 static unsigned long zero_ul;
118 static unsigned long one_ul = 1;
119 static unsigned long long_max = LONG_MAX;
120 static int one_hundred = 100;
121 static int two_hundred = 200;
122 static int one_thousand = 1000;
124 static int ten_thousand = 10000;
126 #ifdef CONFIG_PERF_EVENTS
127 static int six_hundred_forty_kb = 640 * 1024;
130 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
131 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
133 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
134 static int maxolduid = 65535;
135 static int minolduid;
137 static int ngroups_max = NGROUPS_MAX;
138 static const int cap_last_cap = CAP_LAST_CAP;
141 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
142 * and hung_task_check_interval_secs
144 #ifdef CONFIG_DETECT_HUNG_TASK
145 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
148 #ifdef CONFIG_INOTIFY_USER
149 #include <linux/inotify.h>
152 #ifdef CONFIG_PROC_SYSCTL
155 * enum sysctl_writes_mode - supported sysctl write modes
157 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
158 * to be written, and multiple writes on the same sysctl file descriptor
159 * will rewrite the sysctl value, regardless of file position. No warning
160 * is issued when the initial position is not 0.
161 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
163 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
164 * file position 0 and the value must be fully contained in the buffer
165 * sent to the write syscall. If dealing with strings respect the file
166 * position, but restrict this to the max length of the buffer, anything
167 * passed the max length will be ignored. Multiple writes will append
170 * These write modes control how current file position affects the behavior of
171 * updating sysctl values through the proc interface on each write.
173 enum sysctl_writes_mode {
174 SYSCTL_WRITES_LEGACY = -1,
175 SYSCTL_WRITES_WARN = 0,
176 SYSCTL_WRITES_STRICT = 1,
179 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
180 #endif /* CONFIG_PROC_SYSCTL */
182 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
183 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
184 int sysctl_legacy_va_layout;
187 #ifdef CONFIG_SCHED_DEBUG
188 static int min_sched_granularity_ns = 100000; /* 100 usecs */
189 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
190 static int min_wakeup_granularity_ns; /* 0 usecs */
191 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
193 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
194 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
195 #endif /* CONFIG_SMP */
196 #endif /* CONFIG_SCHED_DEBUG */
198 #ifdef CONFIG_COMPACTION
199 static int min_extfrag_threshold;
200 static int max_extfrag_threshold = 1000;
203 #endif /* CONFIG_SYSCTL */
205 #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL)
206 static int bpf_stats_handler(struct ctl_table *table, int write,
207 void __user *buffer, size_t *lenp,
210 struct static_key *key = (struct static_key *)table->data;
211 static int saved_val;
213 struct ctl_table tmp = {
215 .maxlen = sizeof(val),
217 .extra1 = SYSCTL_ZERO,
218 .extra2 = SYSCTL_ONE,
221 if (write && !capable(CAP_SYS_ADMIN))
224 mutex_lock(&bpf_stats_enabled_mutex);
226 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
227 if (write && !ret && val != saved_val) {
229 static_key_slow_inc(key);
231 static_key_slow_dec(key);
234 mutex_unlock(&bpf_stats_enabled_mutex);
243 #ifdef CONFIG_PROC_SYSCTL
245 static int _proc_do_string(char *data, int maxlen, int write,
246 char *buffer, size_t *lenp, loff_t *ppos)
251 if (!data || !maxlen || !*lenp) {
257 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
258 /* Only continue writes not past the end of buffer. */
260 if (len > maxlen - 1)
267 /* Start writing from beginning of buffer. */
273 while ((p - buffer) < *lenp && len < maxlen - 1) {
275 if (c == 0 || c == '\n')
296 memcpy(buffer, data, len);
307 static void warn_sysctl_write(struct ctl_table *table)
309 pr_warn_once("%s wrote to %s when file position was not 0!\n"
310 "This will not be supported in the future. To silence this\n"
311 "warning, set kernel.sysctl_writes_strict = -1\n",
312 current->comm, table->procname);
316 * proc_first_pos_non_zero_ignore - check if first position is allowed
317 * @ppos: file position
318 * @table: the sysctl table
320 * Returns true if the first position is non-zero and the sysctl_writes_strict
321 * mode indicates this is not allowed for numeric input types. String proc
322 * handlers can ignore the return value.
324 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
325 struct ctl_table *table)
330 switch (sysctl_writes_strict) {
331 case SYSCTL_WRITES_STRICT:
333 case SYSCTL_WRITES_WARN:
334 warn_sysctl_write(table);
342 * proc_dostring - read a string sysctl
343 * @table: the sysctl table
344 * @write: %TRUE if this is a write to the sysctl file
345 * @buffer: the user buffer
346 * @lenp: the size of the user buffer
347 * @ppos: file position
349 * Reads/writes a string from/to the user buffer. If the kernel
350 * buffer provided is not large enough to hold the string, the
351 * string is truncated. The copied string is %NULL-terminated.
352 * If the string is being read by the user process, it is copied
353 * and a newline '\n' is added. It is truncated if the buffer is
356 * Returns 0 on success.
358 int proc_dostring(struct ctl_table *table, int write,
359 void *buffer, size_t *lenp, loff_t *ppos)
362 proc_first_pos_non_zero_ignore(ppos, table);
364 return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
368 static size_t proc_skip_spaces(char **buf)
371 char *tmp = skip_spaces(*buf);
377 static void proc_skip_char(char **buf, size_t *size, const char v)
388 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
391 * @cp: kernel buffer containing the string to parse
392 * @endp: pointer to store the trailing characters
393 * @base: the base to use
394 * @res: where the parsed integer will be stored
396 * In case of success 0 is returned and @res will contain the parsed integer,
397 * @endp will hold any trailing characters.
398 * This function will fail the parse on overflow. If there wasn't an overflow
399 * the function will defer the decision what characters count as invalid to the
402 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
405 unsigned long long result;
408 cp = _parse_integer_fixup_radix(cp, &base);
409 rv = _parse_integer(cp, base, &result);
410 if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
418 *res = (unsigned long)result;
424 * proc_get_long - reads an ASCII formatted integer from a user buffer
426 * @buf: a kernel buffer
427 * @size: size of the kernel buffer
428 * @val: this is where the number will be stored
429 * @neg: set to %TRUE if number is negative
430 * @perm_tr: a vector which contains the allowed trailers
431 * @perm_tr_len: size of the perm_tr vector
432 * @tr: pointer to store the trailer character
434 * In case of success %0 is returned and @buf and @size are updated with
435 * the amount of bytes read. If @tr is non-NULL and a trailing
436 * character exists (size is non-zero after returning from this
437 * function), @tr is updated with the trailing character.
439 static int proc_get_long(char **buf, size_t *size,
440 unsigned long *val, bool *neg,
441 const char *perm_tr, unsigned perm_tr_len, char *tr)
444 char *p, tmp[TMPBUFLEN];
450 if (len > TMPBUFLEN - 1)
453 memcpy(tmp, *buf, len);
457 if (*p == '-' && *size > 1) {
465 if (strtoul_lenient(p, &p, 0, val))
470 /* We don't know if the next char is whitespace thus we may accept
471 * invalid integers (e.g. 1234...a) or two integers instead of one
472 * (e.g. 123...1). So lets not allow such large numbers. */
473 if (len == TMPBUFLEN - 1)
476 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
479 if (tr && (len < *size))
489 * proc_put_long - converts an integer to a decimal ASCII formatted string
491 * @buf: the user buffer
492 * @size: the size of the user buffer
493 * @val: the integer to be converted
494 * @neg: sign of the number, %TRUE for negative
496 * In case of success @buf and @size are updated with the amount of bytes
499 static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
502 char tmp[TMPBUFLEN], *p = tmp;
504 sprintf(p, "%s%lu", neg ? "-" : "", val);
508 memcpy(*buf, tmp, len);
514 static void proc_put_char(void **buf, size_t *size, char c)
517 char **buffer = (char **)buf;
526 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
528 int write, void *data)
532 if (*lvalp > (unsigned long) INT_MAX + 1)
536 if (*lvalp > (unsigned long) INT_MAX)
544 *lvalp = -(unsigned long)val;
547 *lvalp = (unsigned long)val;
553 static int do_proc_douintvec_conv(unsigned long *lvalp,
555 int write, void *data)
558 if (*lvalp > UINT_MAX)
562 unsigned int val = *valp;
563 *lvalp = (unsigned long)val;
568 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
570 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
571 int write, void *buffer,
572 size_t *lenp, loff_t *ppos,
573 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
574 int write, void *data),
577 int *i, vleft, first = 1, err = 0;
581 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
586 i = (int *) tbl_data;
587 vleft = table->maxlen / sizeof(*i);
591 conv = do_proc_dointvec_conv;
594 if (proc_first_pos_non_zero_ignore(ppos, table))
597 if (left > PAGE_SIZE - 1)
598 left = PAGE_SIZE - 1;
602 for (; left && vleft--; i++, first=0) {
607 left -= proc_skip_spaces(&p);
611 err = proc_get_long(&p, &left, &lval, &neg,
613 sizeof(proc_wspace_sep), NULL);
616 if (conv(&neg, &lval, i, 1, data)) {
621 if (conv(&neg, &lval, i, 0, data)) {
626 proc_put_char(&buffer, &left, '\t');
627 proc_put_long(&buffer, &left, lval, neg);
631 if (!write && !first && left && !err)
632 proc_put_char(&buffer, &left, '\n');
633 if (write && !err && left)
634 left -= proc_skip_spaces(&p);
636 return err ? : -EINVAL;
643 static int do_proc_dointvec(struct ctl_table *table, int write,
644 void *buffer, size_t *lenp, loff_t *ppos,
645 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
646 int write, void *data),
649 return __do_proc_dointvec(table->data, table, write,
650 buffer, lenp, ppos, conv, data);
653 static int do_proc_douintvec_w(unsigned int *tbl_data,
654 struct ctl_table *table,
656 size_t *lenp, loff_t *ppos,
657 int (*conv)(unsigned long *lvalp,
659 int write, void *data),
670 if (proc_first_pos_non_zero_ignore(ppos, table))
673 if (left > PAGE_SIZE - 1)
674 left = PAGE_SIZE - 1;
676 left -= proc_skip_spaces(&p);
682 err = proc_get_long(&p, &left, &lval, &neg,
684 sizeof(proc_wspace_sep), NULL);
690 if (conv(&lval, tbl_data, 1, data)) {
696 left -= proc_skip_spaces(&p);
704 /* This is in keeping with old __do_proc_dointvec() */
710 static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
711 size_t *lenp, loff_t *ppos,
712 int (*conv)(unsigned long *lvalp,
714 int write, void *data),
723 if (conv(&lval, tbl_data, 0, data)) {
728 proc_put_long(&buffer, &left, lval, false);
732 proc_put_char(&buffer, &left, '\n');
741 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
742 int write, void *buffer,
743 size_t *lenp, loff_t *ppos,
744 int (*conv)(unsigned long *lvalp,
746 int write, void *data),
749 unsigned int *i, vleft;
751 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
756 i = (unsigned int *) tbl_data;
757 vleft = table->maxlen / sizeof(*i);
760 * Arrays are not supported, keep this simple. *Do not* add
769 conv = do_proc_douintvec_conv;
772 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
774 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
777 static int do_proc_douintvec(struct ctl_table *table, int write,
778 void *buffer, size_t *lenp, loff_t *ppos,
779 int (*conv)(unsigned long *lvalp,
781 int write, void *data),
784 return __do_proc_douintvec(table->data, table, write,
785 buffer, lenp, ppos, conv, data);
789 * proc_dointvec - read a vector of integers
790 * @table: the sysctl table
791 * @write: %TRUE if this is a write to the sysctl file
792 * @buffer: the user buffer
793 * @lenp: the size of the user buffer
794 * @ppos: file position
796 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
797 * values from/to the user buffer, treated as an ASCII string.
799 * Returns 0 on success.
801 int proc_dointvec(struct ctl_table *table, int write, void *buffer,
802 size_t *lenp, loff_t *ppos)
804 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
807 #ifdef CONFIG_COMPACTION
808 static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
809 int write, void *buffer, size_t *lenp, loff_t *ppos)
813 if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)
814 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
816 old = *(int *)table->data;
817 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
820 if (old != *(int *)table->data)
821 pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
822 table->procname, current->comm,
823 task_pid_nr(current));
829 * proc_douintvec - read a vector of unsigned integers
830 * @table: the sysctl table
831 * @write: %TRUE if this is a write to the sysctl file
832 * @buffer: the user buffer
833 * @lenp: the size of the user buffer
834 * @ppos: file position
836 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
837 * values from/to the user buffer, treated as an ASCII string.
839 * Returns 0 on success.
841 int proc_douintvec(struct ctl_table *table, int write, void *buffer,
842 size_t *lenp, loff_t *ppos)
844 return do_proc_douintvec(table, write, buffer, lenp, ppos,
845 do_proc_douintvec_conv, NULL);
849 * Taint values can only be increased
850 * This means we can safely use a temporary.
852 static int proc_taint(struct ctl_table *table, int write,
853 void *buffer, size_t *lenp, loff_t *ppos)
856 unsigned long tmptaint = get_taint();
859 if (write && !capable(CAP_SYS_ADMIN))
864 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
872 * If we are relying on panic_on_taint not producing
873 * false positives due to userspace input, bail out
874 * before setting the requested taint flags.
876 if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
880 * Poor man's atomic or. Not worth adding a primitive
881 * to everyone's atomic.h for this
883 for (i = 0; i < TAINT_FLAGS_COUNT; i++)
884 if ((1UL << i) & tmptaint)
885 add_taint(i, LOCKDEP_STILL_OK);
892 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
893 void *buffer, size_t *lenp, loff_t *ppos)
895 if (write && !capable(CAP_SYS_ADMIN))
898 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
903 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
904 * @min: pointer to minimum allowable value
905 * @max: pointer to maximum allowable value
907 * The do_proc_dointvec_minmax_conv_param structure provides the
908 * minimum and maximum values for doing range checking for those sysctl
909 * parameters that use the proc_dointvec_minmax() handler.
911 struct do_proc_dointvec_minmax_conv_param {
916 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
918 int write, void *data)
921 struct do_proc_dointvec_minmax_conv_param *param = data;
923 * If writing, first do so via a temporary local int so we can
924 * bounds-check it before touching *valp.
926 int *ip = write ? &tmp : valp;
928 ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
933 if ((param->min && *param->min > tmp) ||
934 (param->max && *param->max < tmp))
943 * proc_dointvec_minmax - read a vector of integers with min/max values
944 * @table: the sysctl table
945 * @write: %TRUE if this is a write to the sysctl file
946 * @buffer: the user buffer
947 * @lenp: the size of the user buffer
948 * @ppos: file position
950 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
951 * values from/to the user buffer, treated as an ASCII string.
953 * This routine will ensure the values are within the range specified by
954 * table->extra1 (min) and table->extra2 (max).
956 * Returns 0 on success or -EINVAL on write when the range check fails.
958 int proc_dointvec_minmax(struct ctl_table *table, int write,
959 void *buffer, size_t *lenp, loff_t *ppos)
961 struct do_proc_dointvec_minmax_conv_param param = {
962 .min = (int *) table->extra1,
963 .max = (int *) table->extra2,
965 return do_proc_dointvec(table, write, buffer, lenp, ppos,
966 do_proc_dointvec_minmax_conv, ¶m);
970 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
971 * @min: pointer to minimum allowable value
972 * @max: pointer to maximum allowable value
974 * The do_proc_douintvec_minmax_conv_param structure provides the
975 * minimum and maximum values for doing range checking for those sysctl
976 * parameters that use the proc_douintvec_minmax() handler.
978 struct do_proc_douintvec_minmax_conv_param {
983 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
985 int write, void *data)
989 struct do_proc_douintvec_minmax_conv_param *param = data;
990 /* write via temporary local uint for bounds-checking */
991 unsigned int *up = write ? &tmp : valp;
993 ret = do_proc_douintvec_conv(lvalp, up, write, data);
998 if ((param->min && *param->min > tmp) ||
999 (param->max && *param->max < tmp))
1009 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
1010 * @table: the sysctl table
1011 * @write: %TRUE if this is a write to the sysctl file
1012 * @buffer: the user buffer
1013 * @lenp: the size of the user buffer
1014 * @ppos: file position
1016 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
1017 * values from/to the user buffer, treated as an ASCII string. Negative
1018 * strings are not allowed.
1020 * This routine will ensure the values are within the range specified by
1021 * table->extra1 (min) and table->extra2 (max). There is a final sanity
1022 * check for UINT_MAX to avoid having to support wrap around uses from
1025 * Returns 0 on success or -ERANGE on write when the range check fails.
1027 int proc_douintvec_minmax(struct ctl_table *table, int write,
1028 void *buffer, size_t *lenp, loff_t *ppos)
1030 struct do_proc_douintvec_minmax_conv_param param = {
1031 .min = (unsigned int *) table->extra1,
1032 .max = (unsigned int *) table->extra2,
1034 return do_proc_douintvec(table, write, buffer, lenp, ppos,
1035 do_proc_douintvec_minmax_conv, ¶m);
1038 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
1040 int write, void *data)
1045 val = round_pipe_size(*lvalp);
1051 unsigned int val = *valp;
1052 *lvalp = (unsigned long) val;
1058 static int proc_dopipe_max_size(struct ctl_table *table, int write,
1059 void *buffer, size_t *lenp, loff_t *ppos)
1061 return do_proc_douintvec(table, write, buffer, lenp, ppos,
1062 do_proc_dopipe_max_size_conv, NULL);
1065 static void validate_coredump_safety(void)
1067 #ifdef CONFIG_COREDUMP
1068 if (suid_dumpable == SUID_DUMP_ROOT &&
1069 core_pattern[0] != '/' && core_pattern[0] != '|') {
1071 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
1072 "Pipe handler or fully qualified core dump path required.\n"
1073 "Set kernel.core_pattern before fs.suid_dumpable.\n"
1079 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
1080 void *buffer, size_t *lenp, loff_t *ppos)
1082 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1084 validate_coredump_safety();
1088 #ifdef CONFIG_COREDUMP
1089 static int proc_dostring_coredump(struct ctl_table *table, int write,
1090 void *buffer, size_t *lenp, loff_t *ppos)
1092 int error = proc_dostring(table, write, buffer, lenp, ppos);
1094 validate_coredump_safety();
1099 #ifdef CONFIG_MAGIC_SYSRQ
1100 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1101 void *buffer, size_t *lenp, loff_t *ppos)
1107 ret = __do_proc_dointvec(&tmp, table, write, buffer,
1108 lenp, ppos, NULL, NULL);
1113 sysrq_toggle_support(tmp);
1119 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
1120 int write, void *buffer, size_t *lenp, loff_t *ppos,
1121 unsigned long convmul, unsigned long convdiv)
1123 unsigned long *i, *min, *max;
1124 int vleft, first = 1, err = 0;
1128 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1133 i = (unsigned long *) data;
1134 min = (unsigned long *) table->extra1;
1135 max = (unsigned long *) table->extra2;
1136 vleft = table->maxlen / sizeof(unsigned long);
1140 if (proc_first_pos_non_zero_ignore(ppos, table))
1143 if (left > PAGE_SIZE - 1)
1144 left = PAGE_SIZE - 1;
1148 for (; left && vleft--; i++, first = 0) {
1154 left -= proc_skip_spaces(&p);
1158 err = proc_get_long(&p, &left, &val, &neg,
1160 sizeof(proc_wspace_sep), NULL);
1165 val = convmul * val / convdiv;
1166 if ((min && val < *min) || (max && val > *max)) {
1172 val = convdiv * (*i) / convmul;
1174 proc_put_char(&buffer, &left, '\t');
1175 proc_put_long(&buffer, &left, val, false);
1179 if (!write && !first && left && !err)
1180 proc_put_char(&buffer, &left, '\n');
1182 left -= proc_skip_spaces(&p);
1184 return err ? : -EINVAL;
1191 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1192 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
1193 unsigned long convdiv)
1195 return __do_proc_doulongvec_minmax(table->data, table, write,
1196 buffer, lenp, ppos, convmul, convdiv);
1200 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1201 * @table: the sysctl table
1202 * @write: %TRUE if this is a write to the sysctl file
1203 * @buffer: the user buffer
1204 * @lenp: the size of the user buffer
1205 * @ppos: file position
1207 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1208 * values from/to the user buffer, treated as an ASCII string.
1210 * This routine will ensure the values are within the range specified by
1211 * table->extra1 (min) and table->extra2 (max).
1213 * Returns 0 on success.
1215 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1216 void *buffer, size_t *lenp, loff_t *ppos)
1218 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1222 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1223 * @table: the sysctl table
1224 * @write: %TRUE if this is a write to the sysctl file
1225 * @buffer: the user buffer
1226 * @lenp: the size of the user buffer
1227 * @ppos: file position
1229 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1230 * values from/to the user buffer, treated as an ASCII string. The values
1231 * are treated as milliseconds, and converted to jiffies when they are stored.
1233 * This routine will ensure the values are within the range specified by
1234 * table->extra1 (min) and table->extra2 (max).
1236 * Returns 0 on success.
1238 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1239 void *buffer, size_t *lenp, loff_t *ppos)
1241 return do_proc_doulongvec_minmax(table, write, buffer,
1242 lenp, ppos, HZ, 1000l);
1246 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1248 int write, void *data)
1251 if (*lvalp > INT_MAX / HZ)
1253 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1259 lval = -(unsigned long)val;
1262 lval = (unsigned long)val;
1269 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1271 int write, void *data)
1274 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
1276 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1282 lval = -(unsigned long)val;
1285 lval = (unsigned long)val;
1287 *lvalp = jiffies_to_clock_t(lval);
1292 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1294 int write, void *data)
1297 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1307 lval = -(unsigned long)val;
1310 lval = (unsigned long)val;
1312 *lvalp = jiffies_to_msecs(lval);
1318 * proc_dointvec_jiffies - read a vector of integers as seconds
1319 * @table: the sysctl table
1320 * @write: %TRUE if this is a write to the sysctl file
1321 * @buffer: the user buffer
1322 * @lenp: the size of the user buffer
1323 * @ppos: file position
1325 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1326 * values from/to the user buffer, treated as an ASCII string.
1327 * The values read are assumed to be in seconds, and are converted into
1330 * Returns 0 on success.
1332 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1333 void *buffer, size_t *lenp, loff_t *ppos)
1335 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1336 do_proc_dointvec_jiffies_conv,NULL);
1340 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1341 * @table: the sysctl table
1342 * @write: %TRUE if this is a write to the sysctl file
1343 * @buffer: the user buffer
1344 * @lenp: the size of the user buffer
1345 * @ppos: pointer to the file position
1347 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1348 * values from/to the user buffer, treated as an ASCII string.
1349 * The values read are assumed to be in 1/USER_HZ seconds, and
1350 * are converted into jiffies.
1352 * Returns 0 on success.
1354 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1355 void *buffer, size_t *lenp, loff_t *ppos)
1357 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1358 do_proc_dointvec_userhz_jiffies_conv,NULL);
1362 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1363 * @table: the sysctl table
1364 * @write: %TRUE if this is a write to the sysctl file
1365 * @buffer: the user buffer
1366 * @lenp: the size of the user buffer
1367 * @ppos: file position
1368 * @ppos: the current position in the file
1370 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1371 * values from/to the user buffer, treated as an ASCII string.
1372 * The values read are assumed to be in 1/1000 seconds, and
1373 * are converted into jiffies.
1375 * Returns 0 on success.
1377 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1378 size_t *lenp, loff_t *ppos)
1380 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1381 do_proc_dointvec_ms_jiffies_conv, NULL);
1384 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1385 size_t *lenp, loff_t *ppos)
1387 struct pid *new_pid;
1391 tmp = pid_vnr(cad_pid);
1393 r = __do_proc_dointvec(&tmp, table, write, buffer,
1394 lenp, ppos, NULL, NULL);
1398 new_pid = find_get_pid(tmp);
1402 put_pid(xchg(&cad_pid, new_pid));
1407 * proc_do_large_bitmap - read/write from/to a large bitmap
1408 * @table: the sysctl table
1409 * @write: %TRUE if this is a write to the sysctl file
1410 * @buffer: the user buffer
1411 * @lenp: the size of the user buffer
1412 * @ppos: file position
1414 * The bitmap is stored at table->data and the bitmap length (in bits)
1417 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1418 * large bitmaps may be represented in a compact manner. Writing into
1419 * the file will clear the bitmap then update it with the given input.
1421 * Returns 0 on success.
1423 int proc_do_large_bitmap(struct ctl_table *table, int write,
1424 void *buffer, size_t *lenp, loff_t *ppos)
1428 size_t left = *lenp;
1429 unsigned long bitmap_len = table->maxlen;
1430 unsigned long *bitmap = *(unsigned long **) table->data;
1431 unsigned long *tmp_bitmap = NULL;
1432 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
1434 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1443 if (left > PAGE_SIZE - 1) {
1444 left = PAGE_SIZE - 1;
1445 /* How much of the buffer we'll skip this pass */
1446 skipped = *lenp - left;
1449 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
1452 proc_skip_char(&p, &left, '\n');
1453 while (!err && left) {
1454 unsigned long val_a, val_b;
1458 /* In case we stop parsing mid-number, we can reset */
1460 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
1463 * If we consumed the entirety of a truncated buffer or
1464 * only one char is left (may be a "-"), then stop here,
1465 * reset, & come back for more.
1467 if ((left <= 1) && skipped) {
1474 if (val_a >= bitmap_len || neg) {
1486 err = proc_get_long(&p, &left, &val_b,
1487 &neg, tr_b, sizeof(tr_b),
1490 * If we consumed all of a truncated buffer or
1491 * then stop here, reset, & come back for more.
1493 if (!left && skipped) {
1500 if (val_b >= bitmap_len || neg ||
1511 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
1513 proc_skip_char(&p, &left, '\n');
1517 unsigned long bit_a, bit_b = 0;
1520 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
1521 if (bit_a >= bitmap_len)
1523 bit_b = find_next_zero_bit(bitmap, bitmap_len,
1527 proc_put_char(&buffer, &left, ',');
1528 proc_put_long(&buffer, &left, bit_a, false);
1529 if (bit_a != bit_b) {
1530 proc_put_char(&buffer, &left, '-');
1531 proc_put_long(&buffer, &left, bit_b, false);
1536 proc_put_char(&buffer, &left, '\n');
1542 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
1544 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
1550 bitmap_free(tmp_bitmap);
1554 #else /* CONFIG_PROC_SYSCTL */
1556 int proc_dostring(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_dointvec_jiffies(struct ctl_table *table, int write,
1587 void *buffer, size_t *lenp, loff_t *ppos)
1592 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1593 void *buffer, size_t *lenp, loff_t *ppos)
1598 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1599 void *buffer, size_t *lenp, loff_t *ppos)
1604 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1605 void *buffer, size_t *lenp, loff_t *ppos)
1610 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1611 void *buffer, size_t *lenp, loff_t *ppos)
1616 int proc_do_large_bitmap(struct ctl_table *table, int write,
1617 void *buffer, size_t *lenp, loff_t *ppos)
1622 #endif /* CONFIG_PROC_SYSCTL */
1624 #if defined(CONFIG_SYSCTL)
1625 int proc_do_static_key(struct ctl_table *table, int write,
1626 void *buffer, size_t *lenp, loff_t *ppos)
1628 struct static_key *key = (struct static_key *)table->data;
1629 static DEFINE_MUTEX(static_key_mutex);
1631 struct ctl_table tmp = {
1633 .maxlen = sizeof(val),
1634 .mode = table->mode,
1635 .extra1 = SYSCTL_ZERO,
1636 .extra2 = SYSCTL_ONE,
1639 if (write && !capable(CAP_SYS_ADMIN))
1642 mutex_lock(&static_key_mutex);
1643 val = static_key_enabled(key);
1644 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1645 if (write && !ret) {
1647 static_key_enable(key);
1649 static_key_disable(key);
1651 mutex_unlock(&static_key_mutex);
1655 static struct ctl_table kern_table[] = {
1657 .procname = "sched_child_runs_first",
1658 .data = &sysctl_sched_child_runs_first,
1659 .maxlen = sizeof(unsigned int),
1661 .proc_handler = proc_dointvec,
1663 #ifdef CONFIG_SCHED_DEBUG
1665 .procname = "sched_min_granularity_ns",
1666 .data = &sysctl_sched_min_granularity,
1667 .maxlen = sizeof(unsigned int),
1669 .proc_handler = sched_proc_update_handler,
1670 .extra1 = &min_sched_granularity_ns,
1671 .extra2 = &max_sched_granularity_ns,
1674 .procname = "sched_latency_ns",
1675 .data = &sysctl_sched_latency,
1676 .maxlen = sizeof(unsigned int),
1678 .proc_handler = sched_proc_update_handler,
1679 .extra1 = &min_sched_granularity_ns,
1680 .extra2 = &max_sched_granularity_ns,
1683 .procname = "sched_wakeup_granularity_ns",
1684 .data = &sysctl_sched_wakeup_granularity,
1685 .maxlen = sizeof(unsigned int),
1687 .proc_handler = sched_proc_update_handler,
1688 .extra1 = &min_wakeup_granularity_ns,
1689 .extra2 = &max_wakeup_granularity_ns,
1693 .procname = "sched_tunable_scaling",
1694 .data = &sysctl_sched_tunable_scaling,
1695 .maxlen = sizeof(enum sched_tunable_scaling),
1697 .proc_handler = sched_proc_update_handler,
1698 .extra1 = &min_sched_tunable_scaling,
1699 .extra2 = &max_sched_tunable_scaling,
1702 .procname = "sched_migration_cost_ns",
1703 .data = &sysctl_sched_migration_cost,
1704 .maxlen = sizeof(unsigned int),
1706 .proc_handler = proc_dointvec,
1709 .procname = "sched_nr_migrate",
1710 .data = &sysctl_sched_nr_migrate,
1711 .maxlen = sizeof(unsigned int),
1713 .proc_handler = proc_dointvec,
1715 #ifdef CONFIG_SCHEDSTATS
1717 .procname = "sched_schedstats",
1719 .maxlen = sizeof(unsigned int),
1721 .proc_handler = sysctl_schedstats,
1722 .extra1 = SYSCTL_ZERO,
1723 .extra2 = SYSCTL_ONE,
1725 #endif /* CONFIG_SCHEDSTATS */
1726 #endif /* CONFIG_SMP */
1727 #ifdef CONFIG_NUMA_BALANCING
1729 .procname = "numa_balancing_scan_delay_ms",
1730 .data = &sysctl_numa_balancing_scan_delay,
1731 .maxlen = sizeof(unsigned int),
1733 .proc_handler = proc_dointvec,
1736 .procname = "numa_balancing_scan_period_min_ms",
1737 .data = &sysctl_numa_balancing_scan_period_min,
1738 .maxlen = sizeof(unsigned int),
1740 .proc_handler = proc_dointvec,
1743 .procname = "numa_balancing_scan_period_max_ms",
1744 .data = &sysctl_numa_balancing_scan_period_max,
1745 .maxlen = sizeof(unsigned int),
1747 .proc_handler = proc_dointvec,
1750 .procname = "numa_balancing_scan_size_mb",
1751 .data = &sysctl_numa_balancing_scan_size,
1752 .maxlen = sizeof(unsigned int),
1754 .proc_handler = proc_dointvec_minmax,
1755 .extra1 = SYSCTL_ONE,
1758 .procname = "numa_balancing",
1759 .data = NULL, /* filled in by handler */
1760 .maxlen = sizeof(unsigned int),
1762 .proc_handler = sysctl_numa_balancing,
1763 .extra1 = SYSCTL_ZERO,
1764 .extra2 = SYSCTL_ONE,
1766 #endif /* CONFIG_NUMA_BALANCING */
1767 #endif /* CONFIG_SCHED_DEBUG */
1769 .procname = "sched_rt_period_us",
1770 .data = &sysctl_sched_rt_period,
1771 .maxlen = sizeof(unsigned int),
1773 .proc_handler = sched_rt_handler,
1776 .procname = "sched_rt_runtime_us",
1777 .data = &sysctl_sched_rt_runtime,
1778 .maxlen = sizeof(int),
1780 .proc_handler = sched_rt_handler,
1783 .procname = "sched_rr_timeslice_ms",
1784 .data = &sysctl_sched_rr_timeslice,
1785 .maxlen = sizeof(int),
1787 .proc_handler = sched_rr_handler,
1789 #ifdef CONFIG_UCLAMP_TASK
1791 .procname = "sched_util_clamp_min",
1792 .data = &sysctl_sched_uclamp_util_min,
1793 .maxlen = sizeof(unsigned int),
1795 .proc_handler = sysctl_sched_uclamp_handler,
1798 .procname = "sched_util_clamp_max",
1799 .data = &sysctl_sched_uclamp_util_max,
1800 .maxlen = sizeof(unsigned int),
1802 .proc_handler = sysctl_sched_uclamp_handler,
1805 #ifdef CONFIG_SCHED_AUTOGROUP
1807 .procname = "sched_autogroup_enabled",
1808 .data = &sysctl_sched_autogroup_enabled,
1809 .maxlen = sizeof(unsigned int),
1811 .proc_handler = proc_dointvec_minmax,
1812 .extra1 = SYSCTL_ZERO,
1813 .extra2 = SYSCTL_ONE,
1816 #ifdef CONFIG_CFS_BANDWIDTH
1818 .procname = "sched_cfs_bandwidth_slice_us",
1819 .data = &sysctl_sched_cfs_bandwidth_slice,
1820 .maxlen = sizeof(unsigned int),
1822 .proc_handler = proc_dointvec_minmax,
1823 .extra1 = SYSCTL_ONE,
1826 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1828 .procname = "sched_energy_aware",
1829 .data = &sysctl_sched_energy_aware,
1830 .maxlen = sizeof(unsigned int),
1832 .proc_handler = sched_energy_aware_handler,
1833 .extra1 = SYSCTL_ZERO,
1834 .extra2 = SYSCTL_ONE,
1837 #ifdef CONFIG_PROVE_LOCKING
1839 .procname = "prove_locking",
1840 .data = &prove_locking,
1841 .maxlen = sizeof(int),
1843 .proc_handler = proc_dointvec,
1846 #ifdef CONFIG_LOCK_STAT
1848 .procname = "lock_stat",
1850 .maxlen = sizeof(int),
1852 .proc_handler = proc_dointvec,
1856 .procname = "panic",
1857 .data = &panic_timeout,
1858 .maxlen = sizeof(int),
1860 .proc_handler = proc_dointvec,
1862 #ifdef CONFIG_COREDUMP
1864 .procname = "core_uses_pid",
1865 .data = &core_uses_pid,
1866 .maxlen = sizeof(int),
1868 .proc_handler = proc_dointvec,
1871 .procname = "core_pattern",
1872 .data = core_pattern,
1873 .maxlen = CORENAME_MAX_SIZE,
1875 .proc_handler = proc_dostring_coredump,
1878 .procname = "core_pipe_limit",
1879 .data = &core_pipe_limit,
1880 .maxlen = sizeof(unsigned int),
1882 .proc_handler = proc_dointvec,
1885 #ifdef CONFIG_PROC_SYSCTL
1887 .procname = "tainted",
1888 .maxlen = sizeof(long),
1890 .proc_handler = proc_taint,
1893 .procname = "sysctl_writes_strict",
1894 .data = &sysctl_writes_strict,
1895 .maxlen = sizeof(int),
1897 .proc_handler = proc_dointvec_minmax,
1899 .extra2 = SYSCTL_ONE,
1902 #ifdef CONFIG_LATENCYTOP
1904 .procname = "latencytop",
1905 .data = &latencytop_enabled,
1906 .maxlen = sizeof(int),
1908 .proc_handler = sysctl_latencytop,
1911 #ifdef CONFIG_BLK_DEV_INITRD
1913 .procname = "real-root-dev",
1914 .data = &real_root_dev,
1915 .maxlen = sizeof(int),
1917 .proc_handler = proc_dointvec,
1921 .procname = "print-fatal-signals",
1922 .data = &print_fatal_signals,
1923 .maxlen = sizeof(int),
1925 .proc_handler = proc_dointvec,
1929 .procname = "reboot-cmd",
1930 .data = reboot_command,
1933 .proc_handler = proc_dostring,
1936 .procname = "stop-a",
1937 .data = &stop_a_enabled,
1938 .maxlen = sizeof (int),
1940 .proc_handler = proc_dointvec,
1943 .procname = "scons-poweroff",
1944 .data = &scons_pwroff,
1945 .maxlen = sizeof (int),
1947 .proc_handler = proc_dointvec,
1950 #ifdef CONFIG_SPARC64
1952 .procname = "tsb-ratio",
1953 .data = &sysctl_tsb_ratio,
1954 .maxlen = sizeof (int),
1956 .proc_handler = proc_dointvec,
1959 #ifdef CONFIG_PARISC
1961 .procname = "soft-power",
1962 .data = &pwrsw_enabled,
1963 .maxlen = sizeof (int),
1965 .proc_handler = proc_dointvec,
1968 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1970 .procname = "unaligned-trap",
1971 .data = &unaligned_enabled,
1972 .maxlen = sizeof (int),
1974 .proc_handler = proc_dointvec,
1978 .procname = "ctrl-alt-del",
1980 .maxlen = sizeof(int),
1982 .proc_handler = proc_dointvec,
1984 #ifdef CONFIG_FUNCTION_TRACER
1986 .procname = "ftrace_enabled",
1987 .data = &ftrace_enabled,
1988 .maxlen = sizeof(int),
1990 .proc_handler = ftrace_enable_sysctl,
1993 #ifdef CONFIG_STACK_TRACER
1995 .procname = "stack_tracer_enabled",
1996 .data = &stack_tracer_enabled,
1997 .maxlen = sizeof(int),
1999 .proc_handler = stack_trace_sysctl,
2002 #ifdef CONFIG_TRACING
2004 .procname = "ftrace_dump_on_oops",
2005 .data = &ftrace_dump_on_oops,
2006 .maxlen = sizeof(int),
2008 .proc_handler = proc_dointvec,
2011 .procname = "traceoff_on_warning",
2012 .data = &__disable_trace_on_warning,
2013 .maxlen = sizeof(__disable_trace_on_warning),
2015 .proc_handler = proc_dointvec,
2018 .procname = "tracepoint_printk",
2019 .data = &tracepoint_printk,
2020 .maxlen = sizeof(tracepoint_printk),
2022 .proc_handler = tracepoint_printk_sysctl,
2025 #ifdef CONFIG_KEXEC_CORE
2027 .procname = "kexec_load_disabled",
2028 .data = &kexec_load_disabled,
2029 .maxlen = sizeof(int),
2031 /* only handle a transition from default "0" to "1" */
2032 .proc_handler = proc_dointvec_minmax,
2033 .extra1 = SYSCTL_ONE,
2034 .extra2 = SYSCTL_ONE,
2037 #ifdef CONFIG_MODULES
2039 .procname = "modprobe",
2040 .data = &modprobe_path,
2041 .maxlen = KMOD_PATH_LEN,
2043 .proc_handler = proc_dostring,
2046 .procname = "modules_disabled",
2047 .data = &modules_disabled,
2048 .maxlen = sizeof(int),
2050 /* only handle a transition from default "0" to "1" */
2051 .proc_handler = proc_dointvec_minmax,
2052 .extra1 = SYSCTL_ONE,
2053 .extra2 = SYSCTL_ONE,
2056 #ifdef CONFIG_UEVENT_HELPER
2058 .procname = "hotplug",
2059 .data = &uevent_helper,
2060 .maxlen = UEVENT_HELPER_PATH_LEN,
2062 .proc_handler = proc_dostring,
2065 #ifdef CONFIG_CHR_DEV_SG
2067 .procname = "sg-big-buff",
2068 .data = &sg_big_buff,
2069 .maxlen = sizeof (int),
2071 .proc_handler = proc_dointvec,
2074 #ifdef CONFIG_BSD_PROCESS_ACCT
2078 .maxlen = 3*sizeof(int),
2080 .proc_handler = proc_dointvec,
2083 #ifdef CONFIG_MAGIC_SYSRQ
2085 .procname = "sysrq",
2087 .maxlen = sizeof (int),
2089 .proc_handler = sysrq_sysctl_handler,
2092 #ifdef CONFIG_PROC_SYSCTL
2094 .procname = "cad_pid",
2096 .maxlen = sizeof (int),
2098 .proc_handler = proc_do_cad_pid,
2102 .procname = "threads-max",
2104 .maxlen = sizeof(int),
2106 .proc_handler = sysctl_max_threads,
2109 .procname = "random",
2111 .child = random_table,
2114 .procname = "usermodehelper",
2116 .child = usermodehelper_table,
2118 #ifdef CONFIG_FW_LOADER_USER_HELPER
2120 .procname = "firmware_config",
2122 .child = firmware_config_table,
2126 .procname = "overflowuid",
2127 .data = &overflowuid,
2128 .maxlen = sizeof(int),
2130 .proc_handler = proc_dointvec_minmax,
2131 .extra1 = &minolduid,
2132 .extra2 = &maxolduid,
2135 .procname = "overflowgid",
2136 .data = &overflowgid,
2137 .maxlen = sizeof(int),
2139 .proc_handler = proc_dointvec_minmax,
2140 .extra1 = &minolduid,
2141 .extra2 = &maxolduid,
2145 .procname = "userprocess_debug",
2146 .data = &show_unhandled_signals,
2147 .maxlen = sizeof(int),
2149 .proc_handler = proc_dointvec,
2154 .procname = "oops_all_cpu_backtrace",
2155 .data = &sysctl_oops_all_cpu_backtrace,
2156 .maxlen = sizeof(int),
2158 .proc_handler = proc_dointvec_minmax,
2159 .extra1 = SYSCTL_ZERO,
2160 .extra2 = SYSCTL_ONE,
2162 #endif /* CONFIG_SMP */
2164 .procname = "pid_max",
2166 .maxlen = sizeof (int),
2168 .proc_handler = proc_dointvec_minmax,
2169 .extra1 = &pid_max_min,
2170 .extra2 = &pid_max_max,
2173 .procname = "panic_on_oops",
2174 .data = &panic_on_oops,
2175 .maxlen = sizeof(int),
2177 .proc_handler = proc_dointvec,
2180 .procname = "panic_print",
2181 .data = &panic_print,
2182 .maxlen = sizeof(unsigned long),
2184 .proc_handler = proc_doulongvec_minmax,
2186 #if defined CONFIG_PRINTK
2188 .procname = "printk",
2189 .data = &console_loglevel,
2190 .maxlen = 4*sizeof(int),
2192 .proc_handler = proc_dointvec,
2195 .procname = "printk_ratelimit",
2196 .data = &printk_ratelimit_state.interval,
2197 .maxlen = sizeof(int),
2199 .proc_handler = proc_dointvec_jiffies,
2202 .procname = "printk_ratelimit_burst",
2203 .data = &printk_ratelimit_state.burst,
2204 .maxlen = sizeof(int),
2206 .proc_handler = proc_dointvec,
2209 .procname = "printk_delay",
2210 .data = &printk_delay_msec,
2211 .maxlen = sizeof(int),
2213 .proc_handler = proc_dointvec_minmax,
2214 .extra1 = SYSCTL_ZERO,
2215 .extra2 = &ten_thousand,
2218 .procname = "printk_devkmsg",
2219 .data = devkmsg_log_str,
2220 .maxlen = DEVKMSG_STR_MAX_SIZE,
2222 .proc_handler = devkmsg_sysctl_set_loglvl,
2225 .procname = "dmesg_restrict",
2226 .data = &dmesg_restrict,
2227 .maxlen = sizeof(int),
2229 .proc_handler = proc_dointvec_minmax_sysadmin,
2230 .extra1 = SYSCTL_ZERO,
2231 .extra2 = SYSCTL_ONE,
2234 .procname = "kptr_restrict",
2235 .data = &kptr_restrict,
2236 .maxlen = sizeof(int),
2238 .proc_handler = proc_dointvec_minmax_sysadmin,
2239 .extra1 = SYSCTL_ZERO,
2244 .procname = "ngroups_max",
2245 .data = &ngroups_max,
2246 .maxlen = sizeof (int),
2248 .proc_handler = proc_dointvec,
2251 .procname = "cap_last_cap",
2252 .data = (void *)&cap_last_cap,
2253 .maxlen = sizeof(int),
2255 .proc_handler = proc_dointvec,
2257 #if defined(CONFIG_LOCKUP_DETECTOR)
2259 .procname = "watchdog",
2260 .data = &watchdog_user_enabled,
2261 .maxlen = sizeof(int),
2263 .proc_handler = proc_watchdog,
2264 .extra1 = SYSCTL_ZERO,
2265 .extra2 = SYSCTL_ONE,
2268 .procname = "watchdog_thresh",
2269 .data = &watchdog_thresh,
2270 .maxlen = sizeof(int),
2272 .proc_handler = proc_watchdog_thresh,
2273 .extra1 = SYSCTL_ZERO,
2277 .procname = "nmi_watchdog",
2278 .data = &nmi_watchdog_user_enabled,
2279 .maxlen = sizeof(int),
2280 .mode = NMI_WATCHDOG_SYSCTL_PERM,
2281 .proc_handler = proc_nmi_watchdog,
2282 .extra1 = SYSCTL_ZERO,
2283 .extra2 = SYSCTL_ONE,
2286 .procname = "watchdog_cpumask",
2287 .data = &watchdog_cpumask_bits,
2290 .proc_handler = proc_watchdog_cpumask,
2292 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
2294 .procname = "soft_watchdog",
2295 .data = &soft_watchdog_user_enabled,
2296 .maxlen = sizeof(int),
2298 .proc_handler = proc_soft_watchdog,
2299 .extra1 = SYSCTL_ZERO,
2300 .extra2 = SYSCTL_ONE,
2303 .procname = "softlockup_panic",
2304 .data = &softlockup_panic,
2305 .maxlen = sizeof(int),
2307 .proc_handler = proc_dointvec_minmax,
2308 .extra1 = SYSCTL_ZERO,
2309 .extra2 = SYSCTL_ONE,
2313 .procname = "softlockup_all_cpu_backtrace",
2314 .data = &sysctl_softlockup_all_cpu_backtrace,
2315 .maxlen = sizeof(int),
2317 .proc_handler = proc_dointvec_minmax,
2318 .extra1 = SYSCTL_ZERO,
2319 .extra2 = SYSCTL_ONE,
2321 #endif /* CONFIG_SMP */
2323 #ifdef CONFIG_HARDLOCKUP_DETECTOR
2325 .procname = "hardlockup_panic",
2326 .data = &hardlockup_panic,
2327 .maxlen = sizeof(int),
2329 .proc_handler = proc_dointvec_minmax,
2330 .extra1 = SYSCTL_ZERO,
2331 .extra2 = SYSCTL_ONE,
2335 .procname = "hardlockup_all_cpu_backtrace",
2336 .data = &sysctl_hardlockup_all_cpu_backtrace,
2337 .maxlen = sizeof(int),
2339 .proc_handler = proc_dointvec_minmax,
2340 .extra1 = SYSCTL_ZERO,
2341 .extra2 = SYSCTL_ONE,
2343 #endif /* CONFIG_SMP */
2347 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
2349 .procname = "unknown_nmi_panic",
2350 .data = &unknown_nmi_panic,
2351 .maxlen = sizeof (int),
2353 .proc_handler = proc_dointvec,
2357 #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
2358 defined(CONFIG_DEBUG_STACKOVERFLOW)
2360 .procname = "panic_on_stackoverflow",
2361 .data = &sysctl_panic_on_stackoverflow,
2362 .maxlen = sizeof(int),
2364 .proc_handler = proc_dointvec,
2367 #if defined(CONFIG_X86)
2369 .procname = "panic_on_unrecovered_nmi",
2370 .data = &panic_on_unrecovered_nmi,
2371 .maxlen = sizeof(int),
2373 .proc_handler = proc_dointvec,
2376 .procname = "panic_on_io_nmi",
2377 .data = &panic_on_io_nmi,
2378 .maxlen = sizeof(int),
2380 .proc_handler = proc_dointvec,
2383 .procname = "bootloader_type",
2384 .data = &bootloader_type,
2385 .maxlen = sizeof (int),
2387 .proc_handler = proc_dointvec,
2390 .procname = "bootloader_version",
2391 .data = &bootloader_version,
2392 .maxlen = sizeof (int),
2394 .proc_handler = proc_dointvec,
2397 .procname = "io_delay_type",
2398 .data = &io_delay_type,
2399 .maxlen = sizeof(int),
2401 .proc_handler = proc_dointvec,
2404 #if defined(CONFIG_MMU)
2406 .procname = "randomize_va_space",
2407 .data = &randomize_va_space,
2408 .maxlen = sizeof(int),
2410 .proc_handler = proc_dointvec,
2413 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
2415 .procname = "spin_retry",
2416 .data = &spin_retry,
2417 .maxlen = sizeof (int),
2419 .proc_handler = proc_dointvec,
2422 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
2424 .procname = "acpi_video_flags",
2425 .data = &acpi_realmode_flags,
2426 .maxlen = sizeof (unsigned long),
2428 .proc_handler = proc_doulongvec_minmax,
2431 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
2433 .procname = "ignore-unaligned-usertrap",
2434 .data = &no_unaligned_warning,
2435 .maxlen = sizeof (int),
2437 .proc_handler = proc_dointvec,
2442 .procname = "unaligned-dump-stack",
2443 .data = &unaligned_dump_stack,
2444 .maxlen = sizeof (int),
2446 .proc_handler = proc_dointvec,
2449 #ifdef CONFIG_DETECT_HUNG_TASK
2452 .procname = "hung_task_all_cpu_backtrace",
2453 .data = &sysctl_hung_task_all_cpu_backtrace,
2454 .maxlen = sizeof(int),
2456 .proc_handler = proc_dointvec_minmax,
2457 .extra1 = SYSCTL_ZERO,
2458 .extra2 = SYSCTL_ONE,
2460 #endif /* CONFIG_SMP */
2462 .procname = "hung_task_panic",
2463 .data = &sysctl_hung_task_panic,
2464 .maxlen = sizeof(int),
2466 .proc_handler = proc_dointvec_minmax,
2467 .extra1 = SYSCTL_ZERO,
2468 .extra2 = SYSCTL_ONE,
2471 .procname = "hung_task_check_count",
2472 .data = &sysctl_hung_task_check_count,
2473 .maxlen = sizeof(int),
2475 .proc_handler = proc_dointvec_minmax,
2476 .extra1 = SYSCTL_ZERO,
2479 .procname = "hung_task_timeout_secs",
2480 .data = &sysctl_hung_task_timeout_secs,
2481 .maxlen = sizeof(unsigned long),
2483 .proc_handler = proc_dohung_task_timeout_secs,
2484 .extra2 = &hung_task_timeout_max,
2487 .procname = "hung_task_check_interval_secs",
2488 .data = &sysctl_hung_task_check_interval_secs,
2489 .maxlen = sizeof(unsigned long),
2491 .proc_handler = proc_dohung_task_timeout_secs,
2492 .extra2 = &hung_task_timeout_max,
2495 .procname = "hung_task_warnings",
2496 .data = &sysctl_hung_task_warnings,
2497 .maxlen = sizeof(int),
2499 .proc_handler = proc_dointvec_minmax,
2503 #ifdef CONFIG_RT_MUTEXES
2505 .procname = "max_lock_depth",
2506 .data = &max_lock_depth,
2507 .maxlen = sizeof(int),
2509 .proc_handler = proc_dointvec,
2513 .procname = "poweroff_cmd",
2514 .data = &poweroff_cmd,
2515 .maxlen = POWEROFF_CMD_PATH_LEN,
2517 .proc_handler = proc_dostring,
2523 .child = key_sysctls,
2526 #ifdef CONFIG_PERF_EVENTS
2528 * User-space scripts rely on the existence of this file
2529 * as a feature check for perf_events being enabled.
2531 * So it's an ABI, do not remove!
2534 .procname = "perf_event_paranoid",
2535 .data = &sysctl_perf_event_paranoid,
2536 .maxlen = sizeof(sysctl_perf_event_paranoid),
2538 .proc_handler = proc_dointvec,
2541 .procname = "perf_event_mlock_kb",
2542 .data = &sysctl_perf_event_mlock,
2543 .maxlen = sizeof(sysctl_perf_event_mlock),
2545 .proc_handler = proc_dointvec,
2548 .procname = "perf_event_max_sample_rate",
2549 .data = &sysctl_perf_event_sample_rate,
2550 .maxlen = sizeof(sysctl_perf_event_sample_rate),
2552 .proc_handler = perf_proc_update_handler,
2553 .extra1 = SYSCTL_ONE,
2556 .procname = "perf_cpu_time_max_percent",
2557 .data = &sysctl_perf_cpu_time_max_percent,
2558 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
2560 .proc_handler = perf_cpu_time_max_percent_handler,
2561 .extra1 = SYSCTL_ZERO,
2562 .extra2 = &one_hundred,
2565 .procname = "perf_event_max_stack",
2566 .data = &sysctl_perf_event_max_stack,
2567 .maxlen = sizeof(sysctl_perf_event_max_stack),
2569 .proc_handler = perf_event_max_stack_handler,
2570 .extra1 = SYSCTL_ZERO,
2571 .extra2 = &six_hundred_forty_kb,
2574 .procname = "perf_event_max_contexts_per_stack",
2575 .data = &sysctl_perf_event_max_contexts_per_stack,
2576 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
2578 .proc_handler = perf_event_max_stack_handler,
2579 .extra1 = SYSCTL_ZERO,
2580 .extra2 = &one_thousand,
2584 .procname = "panic_on_warn",
2585 .data = &panic_on_warn,
2586 .maxlen = sizeof(int),
2588 .proc_handler = proc_dointvec_minmax,
2589 .extra1 = SYSCTL_ZERO,
2590 .extra2 = SYSCTL_ONE,
2592 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
2594 .procname = "timer_migration",
2595 .data = &sysctl_timer_migration,
2596 .maxlen = sizeof(unsigned int),
2598 .proc_handler = timer_migration_handler,
2599 .extra1 = SYSCTL_ZERO,
2600 .extra2 = SYSCTL_ONE,
2603 #ifdef CONFIG_BPF_SYSCALL
2605 .procname = "unprivileged_bpf_disabled",
2606 .data = &sysctl_unprivileged_bpf_disabled,
2607 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
2609 /* only handle a transition from default "0" to "1" */
2610 .proc_handler = proc_dointvec_minmax,
2611 .extra1 = SYSCTL_ONE,
2612 .extra2 = SYSCTL_ONE,
2615 .procname = "bpf_stats_enabled",
2616 .data = &bpf_stats_enabled_key.key,
2617 .maxlen = sizeof(bpf_stats_enabled_key),
2619 .proc_handler = bpf_stats_handler,
2622 #if defined(CONFIG_TREE_RCU)
2624 .procname = "panic_on_rcu_stall",
2625 .data = &sysctl_panic_on_rcu_stall,
2626 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
2628 .proc_handler = proc_dointvec_minmax,
2629 .extra1 = SYSCTL_ZERO,
2630 .extra2 = SYSCTL_ONE,
2633 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
2635 .procname = "stack_erasing",
2637 .maxlen = sizeof(int),
2639 .proc_handler = stack_erasing_sysctl,
2640 .extra1 = SYSCTL_ZERO,
2641 .extra2 = SYSCTL_ONE,
2647 static struct ctl_table vm_table[] = {
2649 .procname = "overcommit_memory",
2650 .data = &sysctl_overcommit_memory,
2651 .maxlen = sizeof(sysctl_overcommit_memory),
2653 .proc_handler = proc_dointvec_minmax,
2654 .extra1 = SYSCTL_ZERO,
2658 .procname = "panic_on_oom",
2659 .data = &sysctl_panic_on_oom,
2660 .maxlen = sizeof(sysctl_panic_on_oom),
2662 .proc_handler = proc_dointvec_minmax,
2663 .extra1 = SYSCTL_ZERO,
2667 .procname = "oom_kill_allocating_task",
2668 .data = &sysctl_oom_kill_allocating_task,
2669 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
2671 .proc_handler = proc_dointvec,
2674 .procname = "oom_dump_tasks",
2675 .data = &sysctl_oom_dump_tasks,
2676 .maxlen = sizeof(sysctl_oom_dump_tasks),
2678 .proc_handler = proc_dointvec,
2681 .procname = "overcommit_ratio",
2682 .data = &sysctl_overcommit_ratio,
2683 .maxlen = sizeof(sysctl_overcommit_ratio),
2685 .proc_handler = overcommit_ratio_handler,
2688 .procname = "overcommit_kbytes",
2689 .data = &sysctl_overcommit_kbytes,
2690 .maxlen = sizeof(sysctl_overcommit_kbytes),
2692 .proc_handler = overcommit_kbytes_handler,
2695 .procname = "page-cluster",
2696 .data = &page_cluster,
2697 .maxlen = sizeof(int),
2699 .proc_handler = proc_dointvec_minmax,
2700 .extra1 = SYSCTL_ZERO,
2703 .procname = "dirty_background_ratio",
2704 .data = &dirty_background_ratio,
2705 .maxlen = sizeof(dirty_background_ratio),
2707 .proc_handler = dirty_background_ratio_handler,
2708 .extra1 = SYSCTL_ZERO,
2709 .extra2 = &one_hundred,
2712 .procname = "dirty_background_bytes",
2713 .data = &dirty_background_bytes,
2714 .maxlen = sizeof(dirty_background_bytes),
2716 .proc_handler = dirty_background_bytes_handler,
2720 .procname = "dirty_ratio",
2721 .data = &vm_dirty_ratio,
2722 .maxlen = sizeof(vm_dirty_ratio),
2724 .proc_handler = dirty_ratio_handler,
2725 .extra1 = SYSCTL_ZERO,
2726 .extra2 = &one_hundred,
2729 .procname = "dirty_bytes",
2730 .data = &vm_dirty_bytes,
2731 .maxlen = sizeof(vm_dirty_bytes),
2733 .proc_handler = dirty_bytes_handler,
2734 .extra1 = &dirty_bytes_min,
2737 .procname = "dirty_writeback_centisecs",
2738 .data = &dirty_writeback_interval,
2739 .maxlen = sizeof(dirty_writeback_interval),
2741 .proc_handler = dirty_writeback_centisecs_handler,
2744 .procname = "dirty_expire_centisecs",
2745 .data = &dirty_expire_interval,
2746 .maxlen = sizeof(dirty_expire_interval),
2748 .proc_handler = proc_dointvec_minmax,
2749 .extra1 = SYSCTL_ZERO,
2752 .procname = "dirtytime_expire_seconds",
2753 .data = &dirtytime_expire_interval,
2754 .maxlen = sizeof(dirtytime_expire_interval),
2756 .proc_handler = dirtytime_interval_handler,
2757 .extra1 = SYSCTL_ZERO,
2760 .procname = "swappiness",
2761 .data = &vm_swappiness,
2762 .maxlen = sizeof(vm_swappiness),
2764 .proc_handler = proc_dointvec_minmax,
2765 .extra1 = SYSCTL_ZERO,
2766 .extra2 = &two_hundred,
2768 #ifdef CONFIG_HUGETLB_PAGE
2770 .procname = "nr_hugepages",
2772 .maxlen = sizeof(unsigned long),
2774 .proc_handler = hugetlb_sysctl_handler,
2778 .procname = "nr_hugepages_mempolicy",
2780 .maxlen = sizeof(unsigned long),
2782 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
2785 .procname = "numa_stat",
2786 .data = &sysctl_vm_numa_stat,
2787 .maxlen = sizeof(int),
2789 .proc_handler = sysctl_vm_numa_stat_handler,
2790 .extra1 = SYSCTL_ZERO,
2791 .extra2 = SYSCTL_ONE,
2795 .procname = "hugetlb_shm_group",
2796 .data = &sysctl_hugetlb_shm_group,
2797 .maxlen = sizeof(gid_t),
2799 .proc_handler = proc_dointvec,
2802 .procname = "nr_overcommit_hugepages",
2804 .maxlen = sizeof(unsigned long),
2806 .proc_handler = hugetlb_overcommit_handler,
2810 .procname = "lowmem_reserve_ratio",
2811 .data = &sysctl_lowmem_reserve_ratio,
2812 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
2814 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
2817 .procname = "drop_caches",
2818 .data = &sysctl_drop_caches,
2819 .maxlen = sizeof(int),
2821 .proc_handler = drop_caches_sysctl_handler,
2822 .extra1 = SYSCTL_ONE,
2825 #ifdef CONFIG_COMPACTION
2827 .procname = "compact_memory",
2828 .data = &sysctl_compact_memory,
2829 .maxlen = sizeof(int),
2831 .proc_handler = sysctl_compaction_handler,
2834 .procname = "extfrag_threshold",
2835 .data = &sysctl_extfrag_threshold,
2836 .maxlen = sizeof(int),
2838 .proc_handler = proc_dointvec_minmax,
2839 .extra1 = &min_extfrag_threshold,
2840 .extra2 = &max_extfrag_threshold,
2843 .procname = "compact_unevictable_allowed",
2844 .data = &sysctl_compact_unevictable_allowed,
2845 .maxlen = sizeof(int),
2847 .proc_handler = proc_dointvec_minmax_warn_RT_change,
2848 .extra1 = SYSCTL_ZERO,
2849 .extra2 = SYSCTL_ONE,
2852 #endif /* CONFIG_COMPACTION */
2854 .procname = "min_free_kbytes",
2855 .data = &min_free_kbytes,
2856 .maxlen = sizeof(min_free_kbytes),
2858 .proc_handler = min_free_kbytes_sysctl_handler,
2859 .extra1 = SYSCTL_ZERO,
2862 .procname = "watermark_boost_factor",
2863 .data = &watermark_boost_factor,
2864 .maxlen = sizeof(watermark_boost_factor),
2866 .proc_handler = proc_dointvec_minmax,
2867 .extra1 = SYSCTL_ZERO,
2870 .procname = "watermark_scale_factor",
2871 .data = &watermark_scale_factor,
2872 .maxlen = sizeof(watermark_scale_factor),
2874 .proc_handler = watermark_scale_factor_sysctl_handler,
2875 .extra1 = SYSCTL_ONE,
2876 .extra2 = &one_thousand,
2879 .procname = "percpu_pagelist_fraction",
2880 .data = &percpu_pagelist_fraction,
2881 .maxlen = sizeof(percpu_pagelist_fraction),
2883 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
2884 .extra1 = SYSCTL_ZERO,
2888 .procname = "max_map_count",
2889 .data = &sysctl_max_map_count,
2890 .maxlen = sizeof(sysctl_max_map_count),
2892 .proc_handler = proc_dointvec_minmax,
2893 .extra1 = SYSCTL_ZERO,
2897 .procname = "nr_trim_pages",
2898 .data = &sysctl_nr_trim_pages,
2899 .maxlen = sizeof(sysctl_nr_trim_pages),
2901 .proc_handler = proc_dointvec_minmax,
2902 .extra1 = SYSCTL_ZERO,
2906 .procname = "laptop_mode",
2907 .data = &laptop_mode,
2908 .maxlen = sizeof(laptop_mode),
2910 .proc_handler = proc_dointvec_jiffies,
2913 .procname = "block_dump",
2914 .data = &block_dump,
2915 .maxlen = sizeof(block_dump),
2917 .proc_handler = proc_dointvec,
2918 .extra1 = SYSCTL_ZERO,
2921 .procname = "vfs_cache_pressure",
2922 .data = &sysctl_vfs_cache_pressure,
2923 .maxlen = sizeof(sysctl_vfs_cache_pressure),
2925 .proc_handler = proc_dointvec,
2926 .extra1 = SYSCTL_ZERO,
2928 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
2929 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
2931 .procname = "legacy_va_layout",
2932 .data = &sysctl_legacy_va_layout,
2933 .maxlen = sizeof(sysctl_legacy_va_layout),
2935 .proc_handler = proc_dointvec,
2936 .extra1 = SYSCTL_ZERO,
2941 .procname = "zone_reclaim_mode",
2942 .data = &node_reclaim_mode,
2943 .maxlen = sizeof(node_reclaim_mode),
2945 .proc_handler = proc_dointvec,
2946 .extra1 = SYSCTL_ZERO,
2949 .procname = "min_unmapped_ratio",
2950 .data = &sysctl_min_unmapped_ratio,
2951 .maxlen = sizeof(sysctl_min_unmapped_ratio),
2953 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
2954 .extra1 = SYSCTL_ZERO,
2955 .extra2 = &one_hundred,
2958 .procname = "min_slab_ratio",
2959 .data = &sysctl_min_slab_ratio,
2960 .maxlen = sizeof(sysctl_min_slab_ratio),
2962 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
2963 .extra1 = SYSCTL_ZERO,
2964 .extra2 = &one_hundred,
2969 .procname = "stat_interval",
2970 .data = &sysctl_stat_interval,
2971 .maxlen = sizeof(sysctl_stat_interval),
2973 .proc_handler = proc_dointvec_jiffies,
2976 .procname = "stat_refresh",
2980 .proc_handler = vmstat_refresh,
2985 .procname = "mmap_min_addr",
2986 .data = &dac_mmap_min_addr,
2987 .maxlen = sizeof(unsigned long),
2989 .proc_handler = mmap_min_addr_handler,
2994 .procname = "numa_zonelist_order",
2995 .data = &numa_zonelist_order,
2996 .maxlen = NUMA_ZONELIST_ORDER_LEN,
2998 .proc_handler = numa_zonelist_order_handler,
3001 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
3002 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
3004 .procname = "vdso_enabled",
3005 #ifdef CONFIG_X86_32
3006 .data = &vdso32_enabled,
3007 .maxlen = sizeof(vdso32_enabled),
3009 .data = &vdso_enabled,
3010 .maxlen = sizeof(vdso_enabled),
3013 .proc_handler = proc_dointvec,
3014 .extra1 = SYSCTL_ZERO,
3017 #ifdef CONFIG_HIGHMEM
3019 .procname = "highmem_is_dirtyable",
3020 .data = &vm_highmem_is_dirtyable,
3021 .maxlen = sizeof(vm_highmem_is_dirtyable),
3023 .proc_handler = proc_dointvec_minmax,
3024 .extra1 = SYSCTL_ZERO,
3025 .extra2 = SYSCTL_ONE,
3028 #ifdef CONFIG_MEMORY_FAILURE
3030 .procname = "memory_failure_early_kill",
3031 .data = &sysctl_memory_failure_early_kill,
3032 .maxlen = sizeof(sysctl_memory_failure_early_kill),
3034 .proc_handler = proc_dointvec_minmax,
3035 .extra1 = SYSCTL_ZERO,
3036 .extra2 = SYSCTL_ONE,
3039 .procname = "memory_failure_recovery",
3040 .data = &sysctl_memory_failure_recovery,
3041 .maxlen = sizeof(sysctl_memory_failure_recovery),
3043 .proc_handler = proc_dointvec_minmax,
3044 .extra1 = SYSCTL_ZERO,
3045 .extra2 = SYSCTL_ONE,
3049 .procname = "user_reserve_kbytes",
3050 .data = &sysctl_user_reserve_kbytes,
3051 .maxlen = sizeof(sysctl_user_reserve_kbytes),
3053 .proc_handler = proc_doulongvec_minmax,
3056 .procname = "admin_reserve_kbytes",
3057 .data = &sysctl_admin_reserve_kbytes,
3058 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
3060 .proc_handler = proc_doulongvec_minmax,
3062 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
3064 .procname = "mmap_rnd_bits",
3065 .data = &mmap_rnd_bits,
3066 .maxlen = sizeof(mmap_rnd_bits),
3068 .proc_handler = proc_dointvec_minmax,
3069 .extra1 = (void *)&mmap_rnd_bits_min,
3070 .extra2 = (void *)&mmap_rnd_bits_max,
3073 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
3075 .procname = "mmap_rnd_compat_bits",
3076 .data = &mmap_rnd_compat_bits,
3077 .maxlen = sizeof(mmap_rnd_compat_bits),
3079 .proc_handler = proc_dointvec_minmax,
3080 .extra1 = (void *)&mmap_rnd_compat_bits_min,
3081 .extra2 = (void *)&mmap_rnd_compat_bits_max,
3084 #ifdef CONFIG_USERFAULTFD
3086 .procname = "unprivileged_userfaultfd",
3087 .data = &sysctl_unprivileged_userfaultfd,
3088 .maxlen = sizeof(sysctl_unprivileged_userfaultfd),
3090 .proc_handler = proc_dointvec_minmax,
3091 .extra1 = SYSCTL_ZERO,
3092 .extra2 = SYSCTL_ONE,
3098 static struct ctl_table fs_table[] = {
3100 .procname = "inode-nr",
3101 .data = &inodes_stat,
3102 .maxlen = 2*sizeof(long),
3104 .proc_handler = proc_nr_inodes,
3107 .procname = "inode-state",
3108 .data = &inodes_stat,
3109 .maxlen = 7*sizeof(long),
3111 .proc_handler = proc_nr_inodes,
3114 .procname = "file-nr",
3115 .data = &files_stat,
3116 .maxlen = sizeof(files_stat),
3118 .proc_handler = proc_nr_files,
3121 .procname = "file-max",
3122 .data = &files_stat.max_files,
3123 .maxlen = sizeof(files_stat.max_files),
3125 .proc_handler = proc_doulongvec_minmax,
3127 .extra2 = &long_max,
3130 .procname = "nr_open",
3131 .data = &sysctl_nr_open,
3132 .maxlen = sizeof(unsigned int),
3134 .proc_handler = proc_dointvec_minmax,
3135 .extra1 = &sysctl_nr_open_min,
3136 .extra2 = &sysctl_nr_open_max,
3139 .procname = "dentry-state",
3140 .data = &dentry_stat,
3141 .maxlen = 6*sizeof(long),
3143 .proc_handler = proc_nr_dentry,
3146 .procname = "overflowuid",
3147 .data = &fs_overflowuid,
3148 .maxlen = sizeof(int),
3150 .proc_handler = proc_dointvec_minmax,
3151 .extra1 = &minolduid,
3152 .extra2 = &maxolduid,
3155 .procname = "overflowgid",
3156 .data = &fs_overflowgid,
3157 .maxlen = sizeof(int),
3159 .proc_handler = proc_dointvec_minmax,
3160 .extra1 = &minolduid,
3161 .extra2 = &maxolduid,
3163 #ifdef CONFIG_FILE_LOCKING
3165 .procname = "leases-enable",
3166 .data = &leases_enable,
3167 .maxlen = sizeof(int),
3169 .proc_handler = proc_dointvec,
3172 #ifdef CONFIG_DNOTIFY
3174 .procname = "dir-notify-enable",
3175 .data = &dir_notify_enable,
3176 .maxlen = sizeof(int),
3178 .proc_handler = proc_dointvec,
3182 #ifdef CONFIG_FILE_LOCKING
3184 .procname = "lease-break-time",
3185 .data = &lease_break_time,
3186 .maxlen = sizeof(int),
3188 .proc_handler = proc_dointvec,
3193 .procname = "aio-nr",
3195 .maxlen = sizeof(aio_nr),
3197 .proc_handler = proc_doulongvec_minmax,
3200 .procname = "aio-max-nr",
3201 .data = &aio_max_nr,
3202 .maxlen = sizeof(aio_max_nr),
3204 .proc_handler = proc_doulongvec_minmax,
3206 #endif /* CONFIG_AIO */
3207 #ifdef CONFIG_INOTIFY_USER
3209 .procname = "inotify",
3211 .child = inotify_table,
3216 .procname = "epoll",
3218 .child = epoll_table,
3223 .procname = "protected_symlinks",
3224 .data = &sysctl_protected_symlinks,
3225 .maxlen = sizeof(int),
3227 .proc_handler = proc_dointvec_minmax,
3228 .extra1 = SYSCTL_ZERO,
3229 .extra2 = SYSCTL_ONE,
3232 .procname = "protected_hardlinks",
3233 .data = &sysctl_protected_hardlinks,
3234 .maxlen = sizeof(int),
3236 .proc_handler = proc_dointvec_minmax,
3237 .extra1 = SYSCTL_ZERO,
3238 .extra2 = SYSCTL_ONE,
3241 .procname = "protected_fifos",
3242 .data = &sysctl_protected_fifos,
3243 .maxlen = sizeof(int),
3245 .proc_handler = proc_dointvec_minmax,
3246 .extra1 = SYSCTL_ZERO,
3250 .procname = "protected_regular",
3251 .data = &sysctl_protected_regular,
3252 .maxlen = sizeof(int),
3254 .proc_handler = proc_dointvec_minmax,
3255 .extra1 = SYSCTL_ZERO,
3259 .procname = "suid_dumpable",
3260 .data = &suid_dumpable,
3261 .maxlen = sizeof(int),
3263 .proc_handler = proc_dointvec_minmax_coredump,
3264 .extra1 = SYSCTL_ZERO,
3267 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
3269 .procname = "binfmt_misc",
3271 .child = sysctl_mount_point,
3275 .procname = "pipe-max-size",
3276 .data = &pipe_max_size,
3277 .maxlen = sizeof(pipe_max_size),
3279 .proc_handler = proc_dopipe_max_size,
3282 .procname = "pipe-user-pages-hard",
3283 .data = &pipe_user_pages_hard,
3284 .maxlen = sizeof(pipe_user_pages_hard),
3286 .proc_handler = proc_doulongvec_minmax,
3289 .procname = "pipe-user-pages-soft",
3290 .data = &pipe_user_pages_soft,
3291 .maxlen = sizeof(pipe_user_pages_soft),
3293 .proc_handler = proc_doulongvec_minmax,
3296 .procname = "mount-max",
3297 .data = &sysctl_mount_max,
3298 .maxlen = sizeof(unsigned int),
3300 .proc_handler = proc_dointvec_minmax,
3301 .extra1 = SYSCTL_ONE,
3306 static struct ctl_table debug_table[] = {
3307 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
3309 .procname = "exception-trace",
3310 .data = &show_unhandled_signals,
3311 .maxlen = sizeof(int),
3313 .proc_handler = proc_dointvec
3316 #if defined(CONFIG_OPTPROBES)
3318 .procname = "kprobes-optimization",
3319 .data = &sysctl_kprobes_optimization,
3320 .maxlen = sizeof(int),
3322 .proc_handler = proc_kprobes_optimization_handler,
3323 .extra1 = SYSCTL_ZERO,
3324 .extra2 = SYSCTL_ONE,
3330 static struct ctl_table dev_table[] = {
3334 static struct ctl_table sysctl_base_table[] = {
3336 .procname = "kernel",
3338 .child = kern_table,
3351 .procname = "debug",
3353 .child = debug_table,
3363 int __init sysctl_init(void)
3365 struct ctl_table_header *hdr;
3367 hdr = register_sysctl_table(sysctl_base_table);
3368 kmemleak_not_leak(hdr);
3371 #endif /* CONFIG_SYSCTL */
3373 * No sense putting this after each symbol definition, twice,
3374 * exception granted :-)
3376 EXPORT_SYMBOL(proc_dointvec);
3377 EXPORT_SYMBOL(proc_douintvec);
3378 EXPORT_SYMBOL(proc_dointvec_jiffies);
3379 EXPORT_SYMBOL(proc_dointvec_minmax);
3380 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3381 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3382 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3383 EXPORT_SYMBOL(proc_dostring);
3384 EXPORT_SYMBOL(proc_doulongvec_minmax);
3385 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3386 EXPORT_SYMBOL(proc_do_large_bitmap);