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/jump_label.h> 9 #include <linux/printk.h> 10 #include <linux/smp.h> 11 12 #include <asm/kup.h> 13 #include <asm/smp.h> 14 15 #ifdef CONFIG_PPC_KUAP 16 struct static_key_false disable_kuap_key; 17 EXPORT_SYMBOL(disable_kuap_key); 18 19 void setup_kuap(bool disabled) 20 { 21 if (disabled) { 22 if (IS_ENABLED(CONFIG_40x)) 23 disable_kuep = true; 24 if (smp_processor_id() == boot_cpuid) 25 static_branch_enable(&disable_kuap_key); 26 return; 27 } 28 29 pr_info("Activating Kernel Userspace Access Protection\n"); 30 31 __prevent_user_access(KUAP_READ_WRITE); 32 } 33 #endif 34