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 15 void setup_kuap(bool disabled) 16 { 17 if (disabled) { 18 if (IS_ENABLED(CONFIG_40x)) 19 disable_kuep = true; 20 if (smp_processor_id() == boot_cpuid) 21 cur_cpu_spec->mmu_features &= ~MMU_FTR_KUAP; 22 return; 23 } 24 25 pr_info("Activating Kernel Userspace Access Protection\n"); 26 27 prevent_user_access(KUAP_READ_WRITE); 28 } 29 #endif 30