From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/arm64/kernel/kaslr.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 arch/arm64/kernel/kaslr.c (limited to 'arch/arm64/kernel/kaslr.c') diff --git a/arch/arm64/kernel/kaslr.c b/arch/arm64/kernel/kaslr.c new file mode 100644 index 0000000000..94a269cd1f --- /dev/null +++ b/arch/arm64/kernel/kaslr.c @@ -0,0 +1,38 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2016 Linaro Ltd + */ + +#include +#include +#include + +#include +#include + +u16 __initdata memstart_offset_seed; + +bool __ro_after_init __kaslr_is_enabled = false; + +void __init kaslr_init(void) +{ + if (cpuid_feature_extract_unsigned_field(arm64_sw_feature_override.val & + arm64_sw_feature_override.mask, + ARM64_SW_FEATURE_OVERRIDE_NOKASLR)) { + 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; +} -- cgit v1.2.3