// 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);}