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-rw-r--r--kernel/sysctl.c2516
1 files changed, 2516 insertions, 0 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
new file mode 100644
index 000000000..c6d9dec11
--- /dev/null
+++ b/kernel/sysctl.c
@@ -0,0 +1,2516 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * sysctl.c: General linux system control interface
+ *
+ * Begun 24 March 1995, Stephen Tweedie
+ * Added /proc support, Dec 1995
+ * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
+ * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
+ * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
+ * Dynamic registration fixes, Stephen Tweedie.
+ * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
+ * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
+ * Horn.
+ * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
+ * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
+ * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
+ * Wendling.
+ * The list_for_each() macro wasn't appropriate for the sysctl loop.
+ * Removed it and replaced it with older style, 03/23/00, Bill Wendling
+ */
+
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/slab.h>
+#include <linux/sysctl.h>
+#include <linux/bitmap.h>
+#include <linux/signal.h>
+#include <linux/panic.h>
+#include <linux/printk.h>
+#include <linux/proc_fs.h>
+#include <linux/security.h>
+#include <linux/ctype.h>
+#include <linux/kmemleak.h>
+#include <linux/filter.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/kobject.h>
+#include <linux/net.h>
+#include <linux/sysrq.h>
+#include <linux/highuid.h>
+#include <linux/writeback.h>
+#include <linux/ratelimit.h>
+#include <linux/compaction.h>
+#include <linux/hugetlb.h>
+#include <linux/initrd.h>
+#include <linux/key.h>
+#include <linux/times.h>
+#include <linux/limits.h>
+#include <linux/dcache.h>
+#include <linux/syscalls.h>
+#include <linux/vmstat.h>
+#include <linux/nfs_fs.h>
+#include <linux/acpi.h>
+#include <linux/reboot.h>
+#include <linux/ftrace.h>
+#include <linux/perf_event.h>
+#include <linux/oom.h>
+#include <linux/kmod.h>
+#include <linux/capability.h>
+#include <linux/binfmts.h>
+#include <linux/sched/sysctl.h>
+#include <linux/mount.h>
+#include <linux/userfaultfd_k.h>
+#include <linux/pid.h>
+
+#include "../lib/kstrtox.h"
+
+#include <linux/uaccess.h>
+#include <asm/processor.h>
+
+#ifdef CONFIG_X86
+#include <asm/nmi.h>
+#include <asm/stacktrace.h>
+#include <asm/io.h>
+#endif
+#ifdef CONFIG_SPARC
+#include <asm/setup.h>
+#endif
+#ifdef CONFIG_RT_MUTEXES
+#include <linux/rtmutex.h>
+#endif
+
+/* shared constants to be used in various sysctls */
+const int sysctl_vals[] = { 0, 1, 2, 3, 4, 100, 200, 1000, 3000, INT_MAX, 65535, -1 };
+EXPORT_SYMBOL(sysctl_vals);
+
+const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX };
+EXPORT_SYMBOL_GPL(sysctl_long_vals);
+
+#if defined(CONFIG_SYSCTL)
+
+/* Constants used for minimum and maximum */
+
+#ifdef CONFIG_PERF_EVENTS
+static const int six_hundred_forty_kb = 640 * 1024;
+#endif
+
+
+static const int ngroups_max = NGROUPS_MAX;
+static const int cap_last_cap = CAP_LAST_CAP;
+
+#ifdef CONFIG_PROC_SYSCTL
+
+/**
+ * enum sysctl_writes_mode - supported sysctl write modes
+ *
+ * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
+ * to be written, and multiple writes on the same sysctl file descriptor
+ * will rewrite the sysctl value, regardless of file position. No warning
+ * is issued when the initial position is not 0.
+ * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
+ * not 0.
+ * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
+ * file position 0 and the value must be fully contained in the buffer
+ * sent to the write syscall. If dealing with strings respect the file
+ * position, but restrict this to the max length of the buffer, anything
+ * passed the max length will be ignored. Multiple writes will append
+ * to the buffer.
+ *
+ * These write modes control how current file position affects the behavior of
+ * updating sysctl values through the proc interface on each write.
+ */
+enum sysctl_writes_mode {
+ SYSCTL_WRITES_LEGACY = -1,
+ SYSCTL_WRITES_WARN = 0,
+ SYSCTL_WRITES_STRICT = 1,
+};
+
+static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
+#endif /* CONFIG_PROC_SYSCTL */
+
+#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
+ defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
+int sysctl_legacy_va_layout;
+#endif
+
+#endif /* CONFIG_SYSCTL */
+
+/*
+ * /proc/sys support
+ */
+
+#ifdef CONFIG_PROC_SYSCTL
+
+static int _proc_do_string(char *data, int maxlen, int write,
+ char *buffer, size_t *lenp, loff_t *ppos)
+{
+ size_t len;
+ char c, *p;
+
+ if (!data || !maxlen || !*lenp) {
+ *lenp = 0;
+ return 0;
+ }
+
+ if (write) {
+ if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
+ /* Only continue writes not past the end of buffer. */
+ len = strlen(data);
+ if (len > maxlen - 1)
+ len = maxlen - 1;
+
+ if (*ppos > len)
+ return 0;
+ len = *ppos;
+ } else {
+ /* Start writing from beginning of buffer. */
+ len = 0;
+ }
+
+ *ppos += *lenp;
+ p = buffer;
+ while ((p - buffer) < *lenp && len < maxlen - 1) {
+ c = *(p++);
+ if (c == 0 || c == '\n')
+ break;
+ data[len++] = c;
+ }
+ data[len] = 0;
+ } else {
+ len = strlen(data);
+ if (len > maxlen)
+ len = maxlen;
+
+ if (*ppos > len) {
+ *lenp = 0;
+ return 0;
+ }
+
+ data += *ppos;
+ len -= *ppos;
+
+ if (len > *lenp)
+ len = *lenp;
+ if (len)
+ memcpy(buffer, data, len);
+ if (len < *lenp) {
+ buffer[len] = '\n';
+ len++;
+ }
+ *lenp = len;
+ *ppos += len;
+ }
+ return 0;
+}
+
+static void warn_sysctl_write(struct ctl_table *table)
+{
+ pr_warn_once("%s wrote to %s when file position was not 0!\n"
+ "This will not be supported in the future. To silence this\n"
+ "warning, set kernel.sysctl_writes_strict = -1\n",
+ current->comm, table->procname);
+}
+
+/**
+ * proc_first_pos_non_zero_ignore - check if first position is allowed
+ * @ppos: file position
+ * @table: the sysctl table
+ *
+ * Returns true if the first position is non-zero and the sysctl_writes_strict
+ * mode indicates this is not allowed for numeric input types. String proc
+ * handlers can ignore the return value.
+ */
+static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
+ struct ctl_table *table)
+{
+ if (!*ppos)
+ return false;
+
+ switch (sysctl_writes_strict) {
+ case SYSCTL_WRITES_STRICT:
+ return true;
+ case SYSCTL_WRITES_WARN:
+ warn_sysctl_write(table);
+ return false;
+ default:
+ return false;
+ }
+}
+
+/**
+ * proc_dostring - read a string sysctl
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * Reads/writes a string from/to the user buffer. If the kernel
+ * buffer provided is not large enough to hold the string, the
+ * string is truncated. The copied string is %NULL-terminated.
+ * If the string is being read by the user process, it is copied
+ * and a newline '\n' is added. It is truncated if the buffer is
+ * not large enough.
+ *
+ * Returns 0 on success.
+ */
+int proc_dostring(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ if (write)
+ proc_first_pos_non_zero_ignore(ppos, table);
+
+ return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
+ ppos);
+}
+
+static void proc_skip_spaces(char **buf, size_t *size)
+{
+ while (*size) {
+ if (!isspace(**buf))
+ break;
+ (*size)--;
+ (*buf)++;
+ }
+}
+
+static void proc_skip_char(char **buf, size_t *size, const char v)
+{
+ while (*size) {
+ if (**buf != v)
+ break;
+ (*size)--;
+ (*buf)++;
+ }
+}
+
+/**
+ * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
+ * fail on overflow
+ *
+ * @cp: kernel buffer containing the string to parse
+ * @endp: pointer to store the trailing characters
+ * @base: the base to use
+ * @res: where the parsed integer will be stored
+ *
+ * In case of success 0 is returned and @res will contain the parsed integer,
+ * @endp will hold any trailing characters.
+ * This function will fail the parse on overflow. If there wasn't an overflow
+ * the function will defer the decision what characters count as invalid to the
+ * caller.
+ */
+static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
+ unsigned long *res)
+{
+ unsigned long long result;
+ unsigned int rv;
+
+ cp = _parse_integer_fixup_radix(cp, &base);
+ rv = _parse_integer(cp, base, &result);
+ if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
+ return -ERANGE;
+
+ cp += rv;
+
+ if (endp)
+ *endp = (char *)cp;
+
+ *res = (unsigned long)result;
+ return 0;
+}
+
+#define TMPBUFLEN 22
+/**
+ * proc_get_long - reads an ASCII formatted integer from a user buffer
+ *
+ * @buf: a kernel buffer
+ * @size: size of the kernel buffer
+ * @val: this is where the number will be stored
+ * @neg: set to %TRUE if number is negative
+ * @perm_tr: a vector which contains the allowed trailers
+ * @perm_tr_len: size of the perm_tr vector
+ * @tr: pointer to store the trailer character
+ *
+ * In case of success %0 is returned and @buf and @size are updated with
+ * the amount of bytes read. If @tr is non-NULL and a trailing
+ * character exists (size is non-zero after returning from this
+ * function), @tr is updated with the trailing character.
+ */
+static int proc_get_long(char **buf, size_t *size,
+ unsigned long *val, bool *neg,
+ const char *perm_tr, unsigned perm_tr_len, char *tr)
+{
+ char *p, tmp[TMPBUFLEN];
+ ssize_t len = *size;
+
+ if (len <= 0)
+ return -EINVAL;
+
+ if (len > TMPBUFLEN - 1)
+ len = TMPBUFLEN - 1;
+
+ memcpy(tmp, *buf, len);
+
+ tmp[len] = 0;
+ p = tmp;
+ if (*p == '-' && *size > 1) {
+ *neg = true;
+ p++;
+ } else
+ *neg = false;
+ if (!isdigit(*p))
+ return -EINVAL;
+
+ if (strtoul_lenient(p, &p, 0, val))
+ return -EINVAL;
+
+ len = p - tmp;
+
+ /* We don't know if the next char is whitespace thus we may accept
+ * invalid integers (e.g. 1234...a) or two integers instead of one
+ * (e.g. 123...1). So lets not allow such large numbers. */
+ if (len == TMPBUFLEN - 1)
+ return -EINVAL;
+
+ if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
+ return -EINVAL;
+
+ if (tr && (len < *size))
+ *tr = *p;
+
+ *buf += len;
+ *size -= len;
+
+ return 0;
+}
+
+/**
+ * proc_put_long - converts an integer to a decimal ASCII formatted string
+ *
+ * @buf: the user buffer
+ * @size: the size of the user buffer
+ * @val: the integer to be converted
+ * @neg: sign of the number, %TRUE for negative
+ *
+ * In case of success @buf and @size are updated with the amount of bytes
+ * written.
+ */
+static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
+{
+ int len;
+ char tmp[TMPBUFLEN], *p = tmp;
+
+ sprintf(p, "%s%lu", neg ? "-" : "", val);
+ len = strlen(tmp);
+ if (len > *size)
+ len = *size;
+ memcpy(*buf, tmp, len);
+ *size -= len;
+ *buf += len;
+}
+#undef TMPBUFLEN
+
+static void proc_put_char(void **buf, size_t *size, char c)
+{
+ if (*size) {
+ char **buffer = (char **)buf;
+ **buffer = c;
+
+ (*size)--;
+ (*buffer)++;
+ *buf = *buffer;
+ }
+}
+
+static int do_proc_dobool_conv(bool *negp, unsigned long *lvalp,
+ int *valp,
+ int write, void *data)
+{
+ if (write) {
+ *(bool *)valp = *lvalp;
+ } else {
+ int val = *(bool *)valp;
+
+ *lvalp = (unsigned long)val;
+ *negp = false;
+ }
+ return 0;
+}
+
+static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
+ int *valp,
+ int write, void *data)
+{
+ if (write) {
+ if (*negp) {
+ if (*lvalp > (unsigned long) INT_MAX + 1)
+ return -EINVAL;
+ WRITE_ONCE(*valp, -*lvalp);
+ } else {
+ if (*lvalp > (unsigned long) INT_MAX)
+ return -EINVAL;
+ WRITE_ONCE(*valp, *lvalp);
+ }
+ } else {
+ int val = READ_ONCE(*valp);
+ if (val < 0) {
+ *negp = true;
+ *lvalp = -(unsigned long)val;
+ } else {
+ *negp = false;
+ *lvalp = (unsigned long)val;
+ }
+ }
+ return 0;
+}
+
+static int do_proc_douintvec_conv(unsigned long *lvalp,
+ unsigned int *valp,
+ int write, void *data)
+{
+ if (write) {
+ if (*lvalp > UINT_MAX)
+ return -EINVAL;
+ WRITE_ONCE(*valp, *lvalp);
+ } else {
+ unsigned int val = READ_ONCE(*valp);
+ *lvalp = (unsigned long)val;
+ }
+ return 0;
+}
+
+static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
+
+static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
+ int write, void *buffer,
+ size_t *lenp, loff_t *ppos,
+ int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
+ int write, void *data),
+ void *data)
+{
+ int *i, vleft, first = 1, err = 0;
+ size_t left;
+ char *p;
+
+ if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
+ *lenp = 0;
+ return 0;
+ }
+
+ i = (int *) tbl_data;
+ vleft = table->maxlen / sizeof(*i);
+ left = *lenp;
+
+ if (!conv)
+ conv = do_proc_dointvec_conv;
+
+ if (write) {
+ if (proc_first_pos_non_zero_ignore(ppos, table))
+ goto out;
+
+ if (left > PAGE_SIZE - 1)
+ left = PAGE_SIZE - 1;
+ p = buffer;
+ }
+
+ for (; left && vleft--; i++, first=0) {
+ unsigned long lval;
+ bool neg;
+
+ if (write) {
+ proc_skip_spaces(&p, &left);
+
+ if (!left)
+ break;
+ err = proc_get_long(&p, &left, &lval, &neg,
+ proc_wspace_sep,
+ sizeof(proc_wspace_sep), NULL);
+ if (err)
+ break;
+ if (conv(&neg, &lval, i, 1, data)) {
+ err = -EINVAL;
+ break;
+ }
+ } else {
+ if (conv(&neg, &lval, i, 0, data)) {
+ err = -EINVAL;
+ break;
+ }
+ if (!first)
+ proc_put_char(&buffer, &left, '\t');
+ proc_put_long(&buffer, &left, lval, neg);
+ }
+ }
+
+ if (!write && !first && left && !err)
+ proc_put_char(&buffer, &left, '\n');
+ if (write && !err && left)
+ proc_skip_spaces(&p, &left);
+ if (write && first)
+ return err ? : -EINVAL;
+ *lenp -= left;
+out:
+ *ppos += *lenp;
+ return err;
+}
+
+static int do_proc_dointvec(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos,
+ int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
+ int write, void *data),
+ void *data)
+{
+ return __do_proc_dointvec(table->data, table, write,
+ buffer, lenp, ppos, conv, data);
+}
+
+static int do_proc_douintvec_w(unsigned int *tbl_data,
+ struct ctl_table *table,
+ void *buffer,
+ size_t *lenp, loff_t *ppos,
+ int (*conv)(unsigned long *lvalp,
+ unsigned int *valp,
+ int write, void *data),
+ void *data)
+{
+ unsigned long lval;
+ int err = 0;
+ size_t left;
+ bool neg;
+ char *p = buffer;
+
+ left = *lenp;
+
+ if (proc_first_pos_non_zero_ignore(ppos, table))
+ goto bail_early;
+
+ if (left > PAGE_SIZE - 1)
+ left = PAGE_SIZE - 1;
+
+ proc_skip_spaces(&p, &left);
+ if (!left) {
+ err = -EINVAL;
+ goto out_free;
+ }
+
+ err = proc_get_long(&p, &left, &lval, &neg,
+ proc_wspace_sep,
+ sizeof(proc_wspace_sep), NULL);
+ if (err || neg) {
+ err = -EINVAL;
+ goto out_free;
+ }
+
+ if (conv(&lval, tbl_data, 1, data)) {
+ err = -EINVAL;
+ goto out_free;
+ }
+
+ if (!err && left)
+ proc_skip_spaces(&p, &left);
+
+out_free:
+ if (err)
+ return -EINVAL;
+
+ return 0;
+
+ /* This is in keeping with old __do_proc_dointvec() */
+bail_early:
+ *ppos += *lenp;
+ return err;
+}
+
+static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
+ size_t *lenp, loff_t *ppos,
+ int (*conv)(unsigned long *lvalp,
+ unsigned int *valp,
+ int write, void *data),
+ void *data)
+{
+ unsigned long lval;
+ int err = 0;
+ size_t left;
+
+ left = *lenp;
+
+ if (conv(&lval, tbl_data, 0, data)) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ proc_put_long(&buffer, &left, lval, false);
+ if (!left)
+ goto out;
+
+ proc_put_char(&buffer, &left, '\n');
+
+out:
+ *lenp -= left;
+ *ppos += *lenp;
+
+ return err;
+}
+
+static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
+ int write, void *buffer,
+ size_t *lenp, loff_t *ppos,
+ int (*conv)(unsigned long *lvalp,
+ unsigned int *valp,
+ int write, void *data),
+ void *data)
+{
+ unsigned int *i, vleft;
+
+ if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
+ *lenp = 0;
+ return 0;
+ }
+
+ i = (unsigned int *) tbl_data;
+ vleft = table->maxlen / sizeof(*i);
+
+ /*
+ * Arrays are not supported, keep this simple. *Do not* add
+ * support for them.
+ */
+ if (vleft != 1) {
+ *lenp = 0;
+ return -EINVAL;
+ }
+
+ if (!conv)
+ conv = do_proc_douintvec_conv;
+
+ if (write)
+ return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
+ conv, data);
+ return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
+}
+
+int do_proc_douintvec(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos,
+ int (*conv)(unsigned long *lvalp,
+ unsigned int *valp,
+ int write, void *data),
+ void *data)
+{
+ return __do_proc_douintvec(table->data, table, write,
+ buffer, lenp, ppos, conv, data);
+}
+
+/**
+ * proc_dobool - read/write a bool
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
+ * values from/to the user buffer, treated as an ASCII string.
+ *
+ * Returns 0 on success.
+ */
+int proc_dobool(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ return do_proc_dointvec(table, write, buffer, lenp, ppos,
+ do_proc_dobool_conv, NULL);
+}
+
+/**
+ * proc_dointvec - read a vector of integers
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
+ * values from/to the user buffer, treated as an ASCII string.
+ *
+ * Returns 0 on success.
+ */
+int proc_dointvec(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
+}
+
+#ifdef CONFIG_COMPACTION
+static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
+ int write, void *buffer, size_t *lenp, loff_t *ppos)
+{
+ int ret, old;
+
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)
+ return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+
+ old = *(int *)table->data;
+ ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+ if (ret)
+ return ret;
+ if (old != *(int *)table->data)
+ pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
+ table->procname, current->comm,
+ task_pid_nr(current));
+ return ret;
+}
+#endif
+
+/**
+ * proc_douintvec - read a vector of unsigned integers
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
+ * values from/to the user buffer, treated as an ASCII string.
+ *
+ * Returns 0 on success.
+ */
+int proc_douintvec(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ return do_proc_douintvec(table, write, buffer, lenp, ppos,
+ do_proc_douintvec_conv, NULL);
+}
+
+/*
+ * Taint values can only be increased
+ * This means we can safely use a temporary.
+ */
+static int proc_taint(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct ctl_table t;
+ unsigned long tmptaint = get_taint();
+ int err;
+
+ if (write && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ t = *table;
+ t.data = &tmptaint;
+ err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
+ if (err < 0)
+ return err;
+
+ if (write) {
+ int i;
+
+ /*
+ * If we are relying on panic_on_taint not producing
+ * false positives due to userspace input, bail out
+ * before setting the requested taint flags.
+ */
+ if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
+ return -EINVAL;
+
+ /*
+ * Poor man's atomic or. Not worth adding a primitive
+ * to everyone's atomic.h for this
+ */
+ for (i = 0; i < TAINT_FLAGS_COUNT; i++)
+ if ((1UL << i) & tmptaint)
+ add_taint(i, LOCKDEP_STILL_OK);
+ }
+
+ return err;
+}
+
+/**
+ * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
+ * @min: pointer to minimum allowable value
+ * @max: pointer to maximum allowable value
+ *
+ * The do_proc_dointvec_minmax_conv_param structure provides the
+ * minimum and maximum values for doing range checking for those sysctl
+ * parameters that use the proc_dointvec_minmax() handler.
+ */
+struct do_proc_dointvec_minmax_conv_param {
+ int *min;
+ int *max;
+};
+
+static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
+ int *valp,
+ int write, void *data)
+{
+ int tmp, ret;
+ struct do_proc_dointvec_minmax_conv_param *param = data;
+ /*
+ * If writing, first do so via a temporary local int so we can
+ * bounds-check it before touching *valp.
+ */
+ int *ip = write ? &tmp : valp;
+
+ ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
+ if (ret)
+ return ret;
+
+ if (write) {
+ if ((param->min && *param->min > tmp) ||
+ (param->max && *param->max < tmp))
+ return -EINVAL;
+ WRITE_ONCE(*valp, tmp);
+ }
+
+ return 0;
+}
+
+/**
+ * proc_dointvec_minmax - read a vector of integers with min/max values
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
+ * values from/to the user buffer, treated as an ASCII string.
+ *
+ * This routine will ensure the values are within the range specified by
+ * table->extra1 (min) and table->extra2 (max).
+ *
+ * Returns 0 on success or -EINVAL on write when the range check fails.
+ */
+int proc_dointvec_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct do_proc_dointvec_minmax_conv_param param = {
+ .min = (int *) table->extra1,
+ .max = (int *) table->extra2,
+ };
+ return do_proc_dointvec(table, write, buffer, lenp, ppos,
+ do_proc_dointvec_minmax_conv, &param);
+}
+
+/**
+ * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
+ * @min: pointer to minimum allowable value
+ * @max: pointer to maximum allowable value
+ *
+ * The do_proc_douintvec_minmax_conv_param structure provides the
+ * minimum and maximum values for doing range checking for those sysctl
+ * parameters that use the proc_douintvec_minmax() handler.
+ */
+struct do_proc_douintvec_minmax_conv_param {
+ unsigned int *min;
+ unsigned int *max;
+};
+
+static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
+ unsigned int *valp,
+ int write, void *data)
+{
+ int ret;
+ unsigned int tmp;
+ struct do_proc_douintvec_minmax_conv_param *param = data;
+ /* write via temporary local uint for bounds-checking */
+ unsigned int *up = write ? &tmp : valp;
+
+ ret = do_proc_douintvec_conv(lvalp, up, write, data);
+ if (ret)
+ return ret;
+
+ if (write) {
+ if ((param->min && *param->min > tmp) ||
+ (param->max && *param->max < tmp))
+ return -ERANGE;
+
+ WRITE_ONCE(*valp, tmp);
+ }
+
+ return 0;
+}
+
+/**
+ * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
+ * values from/to the user buffer, treated as an ASCII string. Negative
+ * strings are not allowed.
+ *
+ * This routine will ensure the values are within the range specified by
+ * table->extra1 (min) and table->extra2 (max). There is a final sanity
+ * check for UINT_MAX to avoid having to support wrap around uses from
+ * userspace.
+ *
+ * Returns 0 on success or -ERANGE on write when the range check fails.
+ */
+int proc_douintvec_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct do_proc_douintvec_minmax_conv_param param = {
+ .min = (unsigned int *) table->extra1,
+ .max = (unsigned int *) table->extra2,
+ };
+ return do_proc_douintvec(table, write, buffer, lenp, ppos,
+ do_proc_douintvec_minmax_conv, &param);
+}
+
+/**
+ * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars
+ * values from/to the user buffer, treated as an ASCII string. Negative
+ * strings are not allowed.
+ *
+ * This routine will ensure the values are within the range specified by
+ * table->extra1 (min) and table->extra2 (max).
+ *
+ * Returns 0 on success or an error on write when the range check fails.
+ */
+int proc_dou8vec_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct ctl_table tmp;
+ unsigned int min = 0, max = 255U, val;
+ u8 *data = table->data;
+ struct do_proc_douintvec_minmax_conv_param param = {
+ .min = &min,
+ .max = &max,
+ };
+ int res;
+
+ /* Do not support arrays yet. */
+ if (table->maxlen != sizeof(u8))
+ return -EINVAL;
+
+ if (table->extra1) {
+ min = *(unsigned int *) table->extra1;
+ if (min > 255U)
+ return -EINVAL;
+ }
+ if (table->extra2) {
+ max = *(unsigned int *) table->extra2;
+ if (max > 255U)
+ return -EINVAL;
+ }
+
+ tmp = *table;
+
+ tmp.maxlen = sizeof(val);
+ tmp.data = &val;
+ val = READ_ONCE(*data);
+ res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,
+ do_proc_douintvec_minmax_conv, &param);
+ if (res)
+ return res;
+ if (write)
+ WRITE_ONCE(*data, val);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
+
+#ifdef CONFIG_MAGIC_SYSRQ
+static int sysrq_sysctl_handler(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ int tmp, ret;
+
+ tmp = sysrq_mask();
+
+ ret = __do_proc_dointvec(&tmp, table, write, buffer,
+ lenp, ppos, NULL, NULL);
+ if (ret || !write)
+ return ret;
+
+ if (write)
+ sysrq_toggle_support(tmp);
+
+ return 0;
+}
+#endif
+
+static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
+ int write, void *buffer, size_t *lenp, loff_t *ppos,
+ unsigned long convmul, unsigned long convdiv)
+{
+ unsigned long *i, *min, *max;
+ int vleft, first = 1, err = 0;
+ size_t left;
+ char *p;
+
+ if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
+ *lenp = 0;
+ return 0;
+ }
+
+ i = data;
+ min = table->extra1;
+ max = table->extra2;
+ vleft = table->maxlen / sizeof(unsigned long);
+ left = *lenp;
+
+ if (write) {
+ if (proc_first_pos_non_zero_ignore(ppos, table))
+ goto out;
+
+ if (left > PAGE_SIZE - 1)
+ left = PAGE_SIZE - 1;
+ p = buffer;
+ }
+
+ for (; left && vleft--; i++, first = 0) {
+ unsigned long val;
+
+ if (write) {
+ bool neg;
+
+ proc_skip_spaces(&p, &left);
+ if (!left)
+ break;
+
+ err = proc_get_long(&p, &left, &val, &neg,
+ proc_wspace_sep,
+ sizeof(proc_wspace_sep), NULL);
+ if (err || neg) {
+ err = -EINVAL;
+ break;
+ }
+
+ val = convmul * val / convdiv;
+ if ((min && val < *min) || (max && val > *max)) {
+ err = -EINVAL;
+ break;
+ }
+ WRITE_ONCE(*i, val);
+ } else {
+ val = convdiv * READ_ONCE(*i) / convmul;
+ if (!first)
+ proc_put_char(&buffer, &left, '\t');
+ proc_put_long(&buffer, &left, val, false);
+ }
+ }
+
+ if (!write && !first && left && !err)
+ proc_put_char(&buffer, &left, '\n');
+ if (write && !err)
+ proc_skip_spaces(&p, &left);
+ if (write && first)
+ return err ? : -EINVAL;
+ *lenp -= left;
+out:
+ *ppos += *lenp;
+ return err;
+}
+
+static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
+ unsigned long convdiv)
+{
+ return __do_proc_doulongvec_minmax(table->data, table, write,
+ buffer, lenp, ppos, convmul, convdiv);
+}
+
+/**
+ * proc_doulongvec_minmax - read a vector of long integers with min/max values
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
+ * values from/to the user buffer, treated as an ASCII string.
+ *
+ * This routine will ensure the values are within the range specified by
+ * table->extra1 (min) and table->extra2 (max).
+ *
+ * Returns 0 on success.
+ */
+int proc_doulongvec_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
+}
+
+/**
+ * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
+ * values from/to the user buffer, treated as an ASCII string. The values
+ * are treated as milliseconds, and converted to jiffies when they are stored.
+ *
+ * This routine will ensure the values are within the range specified by
+ * table->extra1 (min) and table->extra2 (max).
+ *
+ * Returns 0 on success.
+ */
+int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return do_proc_doulongvec_minmax(table, write, buffer,
+ lenp, ppos, HZ, 1000l);
+}
+
+
+static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
+ int *valp,
+ int write, void *data)
+{
+ if (write) {
+ if (*lvalp > INT_MAX / HZ)
+ return 1;
+ if (*negp)
+ WRITE_ONCE(*valp, -*lvalp * HZ);
+ else
+ WRITE_ONCE(*valp, *lvalp * HZ);
+ } else {
+ int val = READ_ONCE(*valp);
+ unsigned long lval;
+ if (val < 0) {
+ *negp = true;
+ lval = -(unsigned long)val;
+ } else {
+ *negp = false;
+ lval = (unsigned long)val;
+ }
+ *lvalp = lval / HZ;
+ }
+ return 0;
+}
+
+static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
+ int *valp,
+ int write, void *data)
+{
+ if (write) {
+ if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
+ return 1;
+ *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
+ } else {
+ int val = *valp;
+ unsigned long lval;
+ if (val < 0) {
+ *negp = true;
+ lval = -(unsigned long)val;
+ } else {
+ *negp = false;
+ lval = (unsigned long)val;
+ }
+ *lvalp = jiffies_to_clock_t(lval);
+ }
+ return 0;
+}
+
+static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
+ int *valp,
+ int write, void *data)
+{
+ if (write) {
+ unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
+
+ if (jif > INT_MAX)
+ return 1;
+ WRITE_ONCE(*valp, (int)jif);
+ } else {
+ int val = READ_ONCE(*valp);
+ unsigned long lval;
+ if (val < 0) {
+ *negp = true;
+ lval = -(unsigned long)val;
+ } else {
+ *negp = false;
+ lval = (unsigned long)val;
+ }
+ *lvalp = jiffies_to_msecs(lval);
+ }
+ return 0;
+}
+
+static int do_proc_dointvec_ms_jiffies_minmax_conv(bool *negp, unsigned long *lvalp,
+ int *valp, int write, void *data)
+{
+ int tmp, ret;
+ struct do_proc_dointvec_minmax_conv_param *param = data;
+ /*
+ * If writing, first do so via a temporary local int so we can
+ * bounds-check it before touching *valp.
+ */
+ int *ip = write ? &tmp : valp;
+
+ ret = do_proc_dointvec_ms_jiffies_conv(negp, lvalp, ip, write, data);
+ if (ret)
+ return ret;
+
+ if (write) {
+ if ((param->min && *param->min > tmp) ||
+ (param->max && *param->max < tmp))
+ return -EINVAL;
+ *valp = tmp;
+ }
+ return 0;
+}
+
+/**
+ * proc_dointvec_jiffies - read a vector of integers as seconds
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
+ * values from/to the user buffer, treated as an ASCII string.
+ * The values read are assumed to be in seconds, and are converted into
+ * jiffies.
+ *
+ * Returns 0 on success.
+ */
+int proc_dointvec_jiffies(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return do_proc_dointvec(table,write,buffer,lenp,ppos,
+ do_proc_dointvec_jiffies_conv,NULL);
+}
+
+int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct do_proc_dointvec_minmax_conv_param param = {
+ .min = (int *) table->extra1,
+ .max = (int *) table->extra2,
+ };
+ return do_proc_dointvec(table, write, buffer, lenp, ppos,
+ do_proc_dointvec_ms_jiffies_minmax_conv, &param);
+}
+
+/**
+ * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: pointer to the file position
+ *
+ * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
+ * values from/to the user buffer, treated as an ASCII string.
+ * The values read are assumed to be in 1/USER_HZ seconds, and
+ * are converted into jiffies.
+ *
+ * Returns 0 on success.
+ */
+int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return do_proc_dointvec(table, write, buffer, lenp, ppos,
+ do_proc_dointvec_userhz_jiffies_conv, NULL);
+}
+
+/**
+ * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ * @ppos: the current position in the file
+ *
+ * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
+ * values from/to the user buffer, treated as an ASCII string.
+ * The values read are assumed to be in 1/1000 seconds, and
+ * are converted into jiffies.
+ *
+ * Returns 0 on success.
+ */
+int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ return do_proc_dointvec(table, write, buffer, lenp, ppos,
+ do_proc_dointvec_ms_jiffies_conv, NULL);
+}
+
+static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ struct pid *new_pid;
+ pid_t tmp;
+ int r;
+
+ tmp = pid_vnr(cad_pid);
+
+ r = __do_proc_dointvec(&tmp, table, write, buffer,
+ lenp, ppos, NULL, NULL);
+ if (r || !write)
+ return r;
+
+ new_pid = find_get_pid(tmp);
+ if (!new_pid)
+ return -ESRCH;
+
+ put_pid(xchg(&cad_pid, new_pid));
+ return 0;
+}
+
+/**
+ * proc_do_large_bitmap - read/write from/to a large bitmap
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * The bitmap is stored at table->data and the bitmap length (in bits)
+ * in table->maxlen.
+ *
+ * We use a range comma separated format (e.g. 1,3-4,10-10) so that
+ * large bitmaps may be represented in a compact manner. Writing into
+ * the file will clear the bitmap then update it with the given input.
+ *
+ * Returns 0 on success.
+ */
+int proc_do_large_bitmap(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ int err = 0;
+ size_t left = *lenp;
+ unsigned long bitmap_len = table->maxlen;
+ unsigned long *bitmap = *(unsigned long **) table->data;
+ unsigned long *tmp_bitmap = NULL;
+ char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
+
+ if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
+ *lenp = 0;
+ return 0;
+ }
+
+ if (write) {
+ char *p = buffer;
+ size_t skipped = 0;
+
+ if (left > PAGE_SIZE - 1) {
+ left = PAGE_SIZE - 1;
+ /* How much of the buffer we'll skip this pass */
+ skipped = *lenp - left;
+ }
+
+ tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
+ if (!tmp_bitmap)
+ return -ENOMEM;
+ proc_skip_char(&p, &left, '\n');
+ while (!err && left) {
+ unsigned long val_a, val_b;
+ bool neg;
+ size_t saved_left;
+
+ /* In case we stop parsing mid-number, we can reset */
+ saved_left = left;
+ err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
+ sizeof(tr_a), &c);
+ /*
+ * If we consumed the entirety of a truncated buffer or
+ * only one char is left (may be a "-"), then stop here,
+ * reset, & come back for more.
+ */
+ if ((left <= 1) && skipped) {
+ left = saved_left;
+ break;
+ }
+
+ if (err)
+ break;
+ if (val_a >= bitmap_len || neg) {
+ err = -EINVAL;
+ break;
+ }
+
+ val_b = val_a;
+ if (left) {
+ p++;
+ left--;
+ }
+
+ if (c == '-') {
+ err = proc_get_long(&p, &left, &val_b,
+ &neg, tr_b, sizeof(tr_b),
+ &c);
+ /*
+ * If we consumed all of a truncated buffer or
+ * then stop here, reset, & come back for more.
+ */
+ if (!left && skipped) {
+ left = saved_left;
+ break;
+ }
+
+ if (err)
+ break;
+ if (val_b >= bitmap_len || neg ||
+ val_a > val_b) {
+ err = -EINVAL;
+ break;
+ }
+ if (left) {
+ p++;
+ left--;
+ }
+ }
+
+ bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
+ proc_skip_char(&p, &left, '\n');
+ }
+ left += skipped;
+ } else {
+ unsigned long bit_a, bit_b = 0;
+ bool first = 1;
+
+ while (left) {
+ bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
+ if (bit_a >= bitmap_len)
+ break;
+ bit_b = find_next_zero_bit(bitmap, bitmap_len,
+ bit_a + 1) - 1;
+
+ if (!first)
+ proc_put_char(&buffer, &left, ',');
+ proc_put_long(&buffer, &left, bit_a, false);
+ if (bit_a != bit_b) {
+ proc_put_char(&buffer, &left, '-');
+ proc_put_long(&buffer, &left, bit_b, false);
+ }
+
+ first = 0; bit_b++;
+ }
+ proc_put_char(&buffer, &left, '\n');
+ }
+
+ if (!err) {
+ if (write) {
+ if (*ppos)
+ bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
+ else
+ bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
+ }
+ *lenp -= left;
+ *ppos += *lenp;
+ }
+
+ bitmap_free(tmp_bitmap);
+ return err;
+}
+
+#else /* CONFIG_PROC_SYSCTL */
+
+int proc_dostring(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_dobool(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_dointvec(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_douintvec(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_dointvec_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_douintvec_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_dou8vec_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_dointvec_jiffies(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_doulongvec_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_do_large_bitmap(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+#endif /* CONFIG_PROC_SYSCTL */
+
+#if defined(CONFIG_SYSCTL)
+int proc_do_static_key(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct static_key *key = (struct static_key *)table->data;
+ static DEFINE_MUTEX(static_key_mutex);
+ int val, ret;
+ struct ctl_table tmp = {
+ .data = &val,
+ .maxlen = sizeof(val),
+ .mode = table->mode,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ };
+
+ if (write && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ mutex_lock(&static_key_mutex);
+ val = static_key_enabled(key);
+ ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
+ if (write && !ret) {
+ if (val)
+ static_key_enable(key);
+ else
+ static_key_disable(key);
+ }
+ mutex_unlock(&static_key_mutex);
+ return ret;
+}
+
+static struct ctl_table kern_table[] = {
+#ifdef CONFIG_NUMA_BALANCING
+ {
+ .procname = "numa_balancing",
+ .data = NULL, /* filled in by handler */
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = sysctl_numa_balancing,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_FOUR,
+ },
+ {
+ .procname = "numa_balancing_promote_rate_limit_MBps",
+ .data = &sysctl_numa_balancing_promote_rate_limit,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ },
+#endif /* CONFIG_NUMA_BALANCING */
+ {
+ .procname = "panic",
+ .data = &panic_timeout,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#ifdef CONFIG_PROC_SYSCTL
+ {
+ .procname = "tainted",
+ .maxlen = sizeof(long),
+ .mode = 0644,
+ .proc_handler = proc_taint,
+ },
+ {
+ .procname = "sysctl_writes_strict",
+ .data = &sysctl_writes_strict,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_NEG_ONE,
+ .extra2 = SYSCTL_ONE,
+ },
+#endif
+ {
+ .procname = "print-fatal-signals",
+ .data = &print_fatal_signals,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#ifdef CONFIG_SPARC
+ {
+ .procname = "reboot-cmd",
+ .data = reboot_command,
+ .maxlen = 256,
+ .mode = 0644,
+ .proc_handler = proc_dostring,
+ },
+ {
+ .procname = "stop-a",
+ .data = &stop_a_enabled,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "scons-poweroff",
+ .data = &scons_pwroff,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#ifdef CONFIG_SPARC64
+ {
+ .procname = "tsb-ratio",
+ .data = &sysctl_tsb_ratio,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#ifdef CONFIG_PARISC
+ {
+ .procname = "soft-power",
+ .data = &pwrsw_enabled,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
+ {
+ .procname = "unaligned-trap",
+ .data = &unaligned_enabled,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#ifdef CONFIG_STACK_TRACER
+ {
+ .procname = "stack_tracer_enabled",
+ .data = &stack_tracer_enabled,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = stack_trace_sysctl,
+ },
+#endif
+#ifdef CONFIG_TRACING
+ {
+ .procname = "ftrace_dump_on_oops",
+ .data = &ftrace_dump_on_oops,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "traceoff_on_warning",
+ .data = &__disable_trace_on_warning,
+ .maxlen = sizeof(__disable_trace_on_warning),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "tracepoint_printk",
+ .data = &tracepoint_printk,
+ .maxlen = sizeof(tracepoint_printk),
+ .mode = 0644,
+ .proc_handler = tracepoint_printk_sysctl,
+ },
+#endif
+#ifdef CONFIG_MODULES
+ {
+ .procname = "modprobe",
+ .data = &modprobe_path,
+ .maxlen = KMOD_PATH_LEN,
+ .mode = 0644,
+ .proc_handler = proc_dostring,
+ },
+ {
+ .procname = "modules_disabled",
+ .data = &modules_disabled,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ /* only handle a transition from default "0" to "1" */
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ONE,
+ .extra2 = SYSCTL_ONE,
+ },
+#endif
+#ifdef CONFIG_UEVENT_HELPER
+ {
+ .procname = "hotplug",
+ .data = &uevent_helper,
+ .maxlen = UEVENT_HELPER_PATH_LEN,
+ .mode = 0644,
+ .proc_handler = proc_dostring,
+ },
+#endif
+#ifdef CONFIG_MAGIC_SYSRQ
+ {
+ .procname = "sysrq",
+ .data = NULL,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = sysrq_sysctl_handler,
+ },
+#endif
+#ifdef CONFIG_PROC_SYSCTL
+ {
+ .procname = "cad_pid",
+ .data = NULL,
+ .maxlen = sizeof (int),
+ .mode = 0600,
+ .proc_handler = proc_do_cad_pid,
+ },
+#endif
+ {
+ .procname = "threads-max",
+ .data = NULL,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = sysctl_max_threads,
+ },
+ {
+ .procname = "usermodehelper",
+ .mode = 0555,
+ .child = usermodehelper_table,
+ },
+ {
+ .procname = "overflowuid",
+ .data = &overflowuid,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_MAXOLDUID,
+ },
+ {
+ .procname = "overflowgid",
+ .data = &overflowgid,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_MAXOLDUID,
+ },
+#ifdef CONFIG_S390
+ {
+ .procname = "userprocess_debug",
+ .data = &show_unhandled_signals,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+ {
+ .procname = "pid_max",
+ .data = &pid_max,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &pid_max_min,
+ .extra2 = &pid_max_max,
+ },
+ {
+ .procname = "panic_on_oops",
+ .data = &panic_on_oops,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "panic_print",
+ .data = &panic_print,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ },
+ {
+ .procname = "ngroups_max",
+ .data = (void *)&ngroups_max,
+ .maxlen = sizeof (int),
+ .mode = 0444,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "cap_last_cap",
+ .data = (void *)&cap_last_cap,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = proc_dointvec,
+ },
+#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
+ {
+ .procname = "unknown_nmi_panic",
+ .data = &unknown_nmi_panic,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+
+#if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
+ defined(CONFIG_DEBUG_STACKOVERFLOW)
+ {
+ .procname = "panic_on_stackoverflow",
+ .data = &sysctl_panic_on_stackoverflow,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#if defined(CONFIG_X86)
+ {
+ .procname = "panic_on_unrecovered_nmi",
+ .data = &panic_on_unrecovered_nmi,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "panic_on_io_nmi",
+ .data = &panic_on_io_nmi,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "bootloader_type",
+ .data = &bootloader_type,
+ .maxlen = sizeof (int),
+ .mode = 0444,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "bootloader_version",
+ .data = &bootloader_version,
+ .maxlen = sizeof (int),
+ .mode = 0444,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "io_delay_type",
+ .data = &io_delay_type,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#if defined(CONFIG_MMU)
+ {
+ .procname = "randomize_va_space",
+ .data = &randomize_va_space,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#if defined(CONFIG_S390) && defined(CONFIG_SMP)
+ {
+ .procname = "spin_retry",
+ .data = &spin_retry,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
+ {
+ .procname = "acpi_video_flags",
+ .data = &acpi_realmode_flags,
+ .maxlen = sizeof (unsigned long),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ },
+#endif
+#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
+ {
+ .procname = "ignore-unaligned-usertrap",
+ .data = &no_unaligned_warning,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#ifdef CONFIG_IA64
+ {
+ .procname = "unaligned-dump-stack",
+ .data = &unaligned_dump_stack,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#ifdef CONFIG_RT_MUTEXES
+ {
+ .procname = "max_lock_depth",
+ .data = &max_lock_depth,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#ifdef CONFIG_KEYS
+ {
+ .procname = "keys",
+ .mode = 0555,
+ .child = key_sysctls,
+ },
+#endif
+#ifdef CONFIG_PERF_EVENTS
+ /*
+ * User-space scripts rely on the existence of this file
+ * as a feature check for perf_events being enabled.
+ *
+ * So it's an ABI, do not remove!
+ */
+ {
+ .procname = "perf_event_paranoid",
+ .data = &sysctl_perf_event_paranoid,
+ .maxlen = sizeof(sysctl_perf_event_paranoid),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "perf_event_mlock_kb",
+ .data = &sysctl_perf_event_mlock,
+ .maxlen = sizeof(sysctl_perf_event_mlock),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "perf_event_max_sample_rate",
+ .data = &sysctl_perf_event_sample_rate,
+ .maxlen = sizeof(sysctl_perf_event_sample_rate),
+ .mode = 0644,
+ .proc_handler = perf_proc_update_handler,
+ .extra1 = SYSCTL_ONE,
+ },
+ {
+ .procname = "perf_cpu_time_max_percent",
+ .data = &sysctl_perf_cpu_time_max_percent,
+ .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
+ .mode = 0644,
+ .proc_handler = perf_cpu_time_max_percent_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE_HUNDRED,
+ },
+ {
+ .procname = "perf_event_max_stack",
+ .data = &sysctl_perf_event_max_stack,
+ .maxlen = sizeof(sysctl_perf_event_max_stack),
+ .mode = 0644,
+ .proc_handler = perf_event_max_stack_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = (void *)&six_hundred_forty_kb,
+ },
+ {
+ .procname = "perf_event_max_contexts_per_stack",
+ .data = &sysctl_perf_event_max_contexts_per_stack,
+ .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
+ .mode = 0644,
+ .proc_handler = perf_event_max_stack_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE_THOUSAND,
+ },
+#endif
+ {
+ .procname = "panic_on_warn",
+ .data = &panic_on_warn,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+#ifdef CONFIG_TREE_RCU
+ {
+ .procname = "panic_on_rcu_stall",
+ .data = &sysctl_panic_on_rcu_stall,
+ .maxlen = sizeof(sysctl_panic_on_rcu_stall),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+ {
+ .procname = "max_rcu_stall_to_panic",
+ .data = &sysctl_max_rcu_stall_to_panic,
+ .maxlen = sizeof(sysctl_max_rcu_stall_to_panic),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ONE,
+ .extra2 = SYSCTL_INT_MAX,
+ },
+#endif
+ { }
+};
+
+static struct ctl_table vm_table[] = {
+ {
+ .procname = "overcommit_memory",
+ .data = &sysctl_overcommit_memory,
+ .maxlen = sizeof(sysctl_overcommit_memory),
+ .mode = 0644,
+ .proc_handler = overcommit_policy_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_TWO,
+ },
+ {
+ .procname = "overcommit_ratio",
+ .data = &sysctl_overcommit_ratio,
+ .maxlen = sizeof(sysctl_overcommit_ratio),
+ .mode = 0644,
+ .proc_handler = overcommit_ratio_handler,
+ },
+ {
+ .procname = "overcommit_kbytes",
+ .data = &sysctl_overcommit_kbytes,
+ .maxlen = sizeof(sysctl_overcommit_kbytes),
+ .mode = 0644,
+ .proc_handler = overcommit_kbytes_handler,
+ },
+ {
+ .procname = "page-cluster",
+ .data = &page_cluster,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ },
+ {
+ .procname = "dirtytime_expire_seconds",
+ .data = &dirtytime_expire_interval,
+ .maxlen = sizeof(dirtytime_expire_interval),
+ .mode = 0644,
+ .proc_handler = dirtytime_interval_handler,
+ .extra1 = SYSCTL_ZERO,
+ },
+ {
+ .procname = "swappiness",
+ .data = &vm_swappiness,
+ .maxlen = sizeof(vm_swappiness),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_TWO_HUNDRED,
+ },
+#ifdef CONFIG_NUMA
+ {
+ .procname = "numa_stat",
+ .data = &sysctl_vm_numa_stat,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = sysctl_vm_numa_stat_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+#endif
+#ifdef CONFIG_HUGETLB_PAGE
+ {
+ .procname = "nr_hugepages",
+ .data = NULL,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = hugetlb_sysctl_handler,
+ },
+#ifdef CONFIG_NUMA
+ {
+ .procname = "nr_hugepages_mempolicy",
+ .data = NULL,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = &hugetlb_mempolicy_sysctl_handler,
+ },
+#endif
+ {
+ .procname = "hugetlb_shm_group",
+ .data = &sysctl_hugetlb_shm_group,
+ .maxlen = sizeof(gid_t),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "nr_overcommit_hugepages",
+ .data = NULL,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = hugetlb_overcommit_handler,
+ },
+#endif
+ {
+ .procname = "lowmem_reserve_ratio",
+ .data = &sysctl_lowmem_reserve_ratio,
+ .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
+ .mode = 0644,
+ .proc_handler = lowmem_reserve_ratio_sysctl_handler,
+ },
+ {
+ .procname = "drop_caches",
+ .data = &sysctl_drop_caches,
+ .maxlen = sizeof(int),
+ .mode = 0200,
+ .proc_handler = drop_caches_sysctl_handler,
+ .extra1 = SYSCTL_ONE,
+ .extra2 = SYSCTL_FOUR,
+ },
+#ifdef CONFIG_COMPACTION
+ {
+ .procname = "compact_memory",
+ .data = NULL,
+ .maxlen = sizeof(int),
+ .mode = 0200,
+ .proc_handler = sysctl_compaction_handler,
+ },
+ {
+ .procname = "compaction_proactiveness",
+ .data = &sysctl_compaction_proactiveness,
+ .maxlen = sizeof(sysctl_compaction_proactiveness),
+ .mode = 0644,
+ .proc_handler = compaction_proactiveness_sysctl_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE_HUNDRED,
+ },
+ {
+ .procname = "extfrag_threshold",
+ .data = &sysctl_extfrag_threshold,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE_THOUSAND,
+ },
+ {
+ .procname = "compact_unevictable_allowed",
+ .data = &sysctl_compact_unevictable_allowed,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax_warn_RT_change,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+
+#endif /* CONFIG_COMPACTION */
+ {
+ .procname = "min_free_kbytes",
+ .data = &min_free_kbytes,
+ .maxlen = sizeof(min_free_kbytes),
+ .mode = 0644,
+ .proc_handler = min_free_kbytes_sysctl_handler,
+ .extra1 = SYSCTL_ZERO,
+ },
+ {
+ .procname = "watermark_boost_factor",
+ .data = &watermark_boost_factor,
+ .maxlen = sizeof(watermark_boost_factor),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ },
+ {
+ .procname = "watermark_scale_factor",
+ .data = &watermark_scale_factor,
+ .maxlen = sizeof(watermark_scale_factor),
+ .mode = 0644,
+ .proc_handler = watermark_scale_factor_sysctl_handler,
+ .extra1 = SYSCTL_ONE,
+ .extra2 = SYSCTL_THREE_THOUSAND,
+ },
+ {
+ .procname = "percpu_pagelist_high_fraction",
+ .data = &percpu_pagelist_high_fraction,
+ .maxlen = sizeof(percpu_pagelist_high_fraction),
+ .mode = 0644,
+ .proc_handler = percpu_pagelist_high_fraction_sysctl_handler,
+ .extra1 = SYSCTL_ZERO,
+ },
+ {
+ .procname = "page_lock_unfairness",
+ .data = &sysctl_page_lock_unfairness,
+ .maxlen = sizeof(sysctl_page_lock_unfairness),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ },
+#ifdef CONFIG_MMU
+ {
+ .procname = "max_map_count",
+ .data = &sysctl_max_map_count,
+ .maxlen = sizeof(sysctl_max_map_count),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ },
+#else
+ {
+ .procname = "nr_trim_pages",
+ .data = &sysctl_nr_trim_pages,
+ .maxlen = sizeof(sysctl_nr_trim_pages),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ },
+#endif
+ {
+ .procname = "vfs_cache_pressure",
+ .data = &sysctl_vfs_cache_pressure,
+ .maxlen = sizeof(sysctl_vfs_cache_pressure),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ },
+#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
+ defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
+ {
+ .procname = "legacy_va_layout",
+ .data = &sysctl_legacy_va_layout,
+ .maxlen = sizeof(sysctl_legacy_va_layout),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ },
+#endif
+#ifdef CONFIG_NUMA
+ {
+ .procname = "zone_reclaim_mode",
+ .data = &node_reclaim_mode,
+ .maxlen = sizeof(node_reclaim_mode),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ },
+ {
+ .procname = "min_unmapped_ratio",
+ .data = &sysctl_min_unmapped_ratio,
+ .maxlen = sizeof(sysctl_min_unmapped_ratio),
+ .mode = 0644,
+ .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE_HUNDRED,
+ },
+ {
+ .procname = "min_slab_ratio",
+ .data = &sysctl_min_slab_ratio,
+ .maxlen = sizeof(sysctl_min_slab_ratio),
+ .mode = 0644,
+ .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE_HUNDRED,
+ },
+#endif
+#ifdef CONFIG_SMP
+ {
+ .procname = "stat_interval",
+ .data = &sysctl_stat_interval,
+ .maxlen = sizeof(sysctl_stat_interval),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "stat_refresh",
+ .data = NULL,
+ .maxlen = 0,
+ .mode = 0600,
+ .proc_handler = vmstat_refresh,
+ },
+#endif
+#ifdef CONFIG_MMU
+ {
+ .procname = "mmap_min_addr",
+ .data = &dac_mmap_min_addr,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = mmap_min_addr_handler,
+ },
+#endif
+#ifdef CONFIG_NUMA
+ {
+ .procname = "numa_zonelist_order",
+ .data = &numa_zonelist_order,
+ .maxlen = NUMA_ZONELIST_ORDER_LEN,
+ .mode = 0644,
+ .proc_handler = numa_zonelist_order_handler,
+ },
+#endif
+#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
+ (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
+ {
+ .procname = "vdso_enabled",
+#ifdef CONFIG_X86_32
+ .data = &vdso32_enabled,
+ .maxlen = sizeof(vdso32_enabled),
+#else
+ .data = &vdso_enabled,
+ .maxlen = sizeof(vdso_enabled),
+#endif
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ .extra1 = SYSCTL_ZERO,
+ },
+#endif
+#ifdef CONFIG_MEMORY_FAILURE
+ {
+ .procname = "memory_failure_early_kill",
+ .data = &sysctl_memory_failure_early_kill,
+ .maxlen = sizeof(sysctl_memory_failure_early_kill),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+ {
+ .procname = "memory_failure_recovery",
+ .data = &sysctl_memory_failure_recovery,
+ .maxlen = sizeof(sysctl_memory_failure_recovery),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+#endif
+ {
+ .procname = "user_reserve_kbytes",
+ .data = &sysctl_user_reserve_kbytes,
+ .maxlen = sizeof(sysctl_user_reserve_kbytes),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ },
+ {
+ .procname = "admin_reserve_kbytes",
+ .data = &sysctl_admin_reserve_kbytes,
+ .maxlen = sizeof(sysctl_admin_reserve_kbytes),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ },
+#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
+ {
+ .procname = "mmap_rnd_bits",
+ .data = &mmap_rnd_bits,
+ .maxlen = sizeof(mmap_rnd_bits),
+ .mode = 0600,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = (void *)&mmap_rnd_bits_min,
+ .extra2 = (void *)&mmap_rnd_bits_max,
+ },
+#endif
+#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
+ {
+ .procname = "mmap_rnd_compat_bits",
+ .data = &mmap_rnd_compat_bits,
+ .maxlen = sizeof(mmap_rnd_compat_bits),
+ .mode = 0600,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = (void *)&mmap_rnd_compat_bits_min,
+ .extra2 = (void *)&mmap_rnd_compat_bits_max,
+ },
+#endif
+#ifdef CONFIG_USERFAULTFD
+ {
+ .procname = "unprivileged_userfaultfd",
+ .data = &sysctl_unprivileged_userfaultfd,
+ .maxlen = sizeof(sysctl_unprivileged_userfaultfd),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+#endif
+ { }
+};
+
+static struct ctl_table debug_table[] = {
+#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
+ {
+ .procname = "exception-trace",
+ .data = &show_unhandled_signals,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+#endif
+ { }
+};
+
+static struct ctl_table dev_table[] = {
+ { }
+};
+
+DECLARE_SYSCTL_BASE(kernel, kern_table);
+DECLARE_SYSCTL_BASE(vm, vm_table);
+DECLARE_SYSCTL_BASE(debug, debug_table);
+DECLARE_SYSCTL_BASE(dev, dev_table);
+
+int __init sysctl_init_bases(void)
+{
+ register_sysctl_base(kernel);
+ register_sysctl_base(vm);
+ register_sysctl_base(debug);
+ register_sysctl_base(dev);
+
+ return 0;
+}
+#endif /* CONFIG_SYSCTL */
+/*
+ * No sense putting this after each symbol definition, twice,
+ * exception granted :-)
+ */
+EXPORT_SYMBOL(proc_dobool);
+EXPORT_SYMBOL(proc_dointvec);
+EXPORT_SYMBOL(proc_douintvec);
+EXPORT_SYMBOL(proc_dointvec_jiffies);
+EXPORT_SYMBOL(proc_dointvec_minmax);
+EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
+EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
+EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
+EXPORT_SYMBOL(proc_dostring);
+EXPORT_SYMBOL(proc_doulongvec_minmax);
+EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
+EXPORT_SYMBOL(proc_do_large_bitmap);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-04 11:09:03 +0000