cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sysctl.c (1936B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * sysctl.c: General linux system control interface
      4 */
      5
      6#include <linux/sysctl.h>
      7#include <linux/printk.h>
      8#include <linux/capability.h>
      9#include <linux/ratelimit.h>
     10#include "internal.h"
     11
     12static const int ten_thousand = 10000;
     13
     14static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
     15				void *buffer, size_t *lenp, loff_t *ppos)
     16{
     17	if (write && !capable(CAP_SYS_ADMIN))
     18		return -EPERM;
     19
     20	return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
     21}
     22
     23static struct ctl_table printk_sysctls[] = {
     24	{
     25		.procname	= "printk",
     26		.data		= &console_loglevel,
     27		.maxlen		= 4*sizeof(int),
     28		.mode		= 0644,
     29		.proc_handler	= proc_dointvec,
     30	},
     31	{
     32		.procname	= "printk_ratelimit",
     33		.data		= &printk_ratelimit_state.interval,
     34		.maxlen		= sizeof(int),
     35		.mode		= 0644,
     36		.proc_handler	= proc_dointvec_jiffies,
     37	},
     38	{
     39		.procname	= "printk_ratelimit_burst",
     40		.data		= &printk_ratelimit_state.burst,
     41		.maxlen		= sizeof(int),
     42		.mode		= 0644,
     43		.proc_handler	= proc_dointvec,
     44	},
     45	{
     46		.procname	= "printk_delay",
     47		.data		= &printk_delay_msec,
     48		.maxlen		= sizeof(int),
     49		.mode		= 0644,
     50		.proc_handler	= proc_dointvec_minmax,
     51		.extra1		= SYSCTL_ZERO,
     52		.extra2		= (void *)&ten_thousand,
     53	},
     54	{
     55		.procname	= "printk_devkmsg",
     56		.data		= devkmsg_log_str,
     57		.maxlen		= DEVKMSG_STR_MAX_SIZE,
     58		.mode		= 0644,
     59		.proc_handler	= devkmsg_sysctl_set_loglvl,
     60	},
     61	{
     62		.procname	= "dmesg_restrict",
     63		.data		= &dmesg_restrict,
     64		.maxlen		= sizeof(int),
     65		.mode		= 0644,
     66		.proc_handler	= proc_dointvec_minmax_sysadmin,
     67		.extra1		= SYSCTL_ZERO,
     68		.extra2		= SYSCTL_ONE,
     69	},
     70	{
     71		.procname	= "kptr_restrict",
     72		.data		= &kptr_restrict,
     73		.maxlen		= sizeof(int),
     74		.mode		= 0644,
     75		.proc_handler	= proc_dointvec_minmax_sysadmin,
     76		.extra1		= SYSCTL_ZERO,
     77		.extra2		= SYSCTL_TWO,
     78	},
     79	{}
     80};
     81
     82void __init printk_sysctl_init(void)
     83{
     84	register_sysctl_init("kernel", printk_sysctls);
     85}