| // SPDX-License-Identifier: GPL-2.0-only | |
| /* | |
| * Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@linaro.org> | |
| */ | |
| #include <linux/cache.h> | |
| #include <linux/init.h> | |
| #include <linux/printk.h> | |
| #include <asm/cpufeature.h> | |
| #include <asm/memory.h> | |
| u16 __initdata memstart_offset_seed; | |
| bool __ro_after_init __kaslr_is_enabled = false; | |
| void __init kaslr_init(void) | |
| { | |
| if (kaslr_disabled_cmdline()) { | |
| pr_info("KASLR disabled on command line\n"); | |
| return; | |
| } | |
| /* | |
| * The KASLR offset modulo MIN_KIMG_ALIGN is taken from the physical | |
| * placement of the image rather than from the seed, so a displacement | |
| * of less than MIN_KIMG_ALIGN means that no seed was provided. | |
| */ | |
| if (kaslr_offset() < MIN_KIMG_ALIGN) { | |
| pr_warn("KASLR disabled due to lack of seed\n"); | |
| return; | |
| } | |
| pr_info("KASLR enabled\n"); | |
| __kaslr_is_enabled = true; | |
| } | |
| static int __init parse_nokaslr(char *unused) | |
| { | |
| /* nokaslr param handling is done by early cpufeature code */ | |
| return 0; | |
| } | |
| early_param("nokaslr", parse_nokaslr); |