86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* sysctl.c: General linux system control interface
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*/
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#include <linux/sysctl.h>
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#include <linux/printk.h>
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#include <linux/capability.h>
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#include <linux/ratelimit.h>
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#include "internal.h"
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static const int ten_thousand = 10000;
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static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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if (write && !capable(CAP_SYS_ADMIN))
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return -EPERM;
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return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
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}
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static struct ctl_table printk_sysctls[] = {
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{
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.procname = "printk",
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.data = &console_loglevel,
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.maxlen = 4*sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "printk_ratelimit",
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.data = &printk_ratelimit_state.interval,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_jiffies,
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},
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{
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.procname = "printk_ratelimit_burst",
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.data = &printk_ratelimit_state.burst,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "printk_delay",
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.data = &printk_delay_msec,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = SYSCTL_ZERO,
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.extra2 = (void *)&ten_thousand,
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},
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{
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.procname = "printk_devkmsg",
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.data = devkmsg_log_str,
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.maxlen = DEVKMSG_STR_MAX_SIZE,
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.mode = 0644,
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.proc_handler = devkmsg_sysctl_set_loglvl,
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},
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{
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.procname = "dmesg_restrict",
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.data = &dmesg_restrict,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax_sysadmin,
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_ONE,
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},
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{
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.procname = "kptr_restrict",
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.data = &kptr_restrict,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax_sysadmin,
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_TWO,
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},
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{}
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};
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void __init printk_sysctl_init(void)
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{
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register_sysctl_init("kernel", printk_sysctls);
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}
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