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 (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
28
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