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