kup.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * This file contains the routines for initializing kernel userspace protection
 4 */
 5
 6#include <linux/export.h>
 7#include <linux/init.h>
 8#include <linux/printk.h>
 9#include <linux/smp.h>
10
11#include <asm/kup.h>
12#include <asm/smp.h>
13
14#ifdef CONFIG_PPC_KUAP
15void setup_kuap(bool disabled)
16{
17	if (disabled) {
18		if (smp_processor_id() == boot_cpuid)
19			cur_cpu_spec->mmu_features &= ~MMU_FTR_KUAP;
20		return;
21	}
22
23	pr_info("Activating Kernel Userspace Access Protection\n");
24
25	prevent_user_access(KUAP_READ_WRITE);
26}
27#endif