[PATCH v5 14/16] x86/cpu: Make LAM depend on LASS
From: Alexander Shishkin
Date: Mon Oct 28 2024 - 12:13:54 EST
To prevent exploits for Spectre based on LAM as demonstrated by the
whitepaper [1], make LAM depend on LASS, which avoids this type of
vulnerability.
[1] https://download.vusec.net/papers/slam_sp24.pdf
Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/cpuid-deps.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c
index 3f73c4b03348..d9fb2423605e 100644
--- a/arch/x86/kernel/cpu/cpuid-deps.c
+++ b/arch/x86/kernel/cpu/cpuid-deps.c
@@ -84,6 +84,7 @@ static const struct cpuid_dep cpuid_deps[] = {
{ X86_FEATURE_SHSTK, X86_FEATURE_XSAVES },
{ X86_FEATURE_FRED, X86_FEATURE_LKGS },
{ X86_FEATURE_LASS, X86_FEATURE_SMAP },
+ { X86_FEATURE_LAM, X86_FEATURE_LASS },
{}
};
--
2.45.2