| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * This file contains the routines for initializing kernel userspace protection |
| */ |
| |
| #include <linux/export.h> |
| #include <linux/init.h> |
| #include <linux/jump_label.h> |
| #include <linux/printk.h> |
| #include <linux/smp.h> |
| |
| #include <asm/kup.h> |
| #include <asm/smp.h> |
| |
| #ifdef CONFIG_PPC_KUAP |
| struct static_key_false disable_kuap_key; |
| EXPORT_SYMBOL(disable_kuap_key); |
| |
| void setup_kuap(bool disabled) |
| { |
| if (disabled) { |
| if (IS_ENABLED(CONFIG_40x)) |
| disable_kuep = true; |
| if (smp_processor_id() == boot_cpuid) |
| static_branch_enable(&disable_kuap_key); |
| return; |
| } |
| |
| pr_info("Activating Kernel Userspace Access Protection\n"); |
| |
| __prevent_user_access(KUAP_READ_WRITE); |
| } |
| #endif |
