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[PATCHv6,14/16] x86/cpu: Make LAM depend on LASS

Message ID 20250620135325.3300848-15-kirill.shutemov@linux.intel.com
State New
Headers show
Series x86: Enable Linear Address Space Separation support | expand

Commit Message

Kirill A. Shutemov June 20, 2025, 1:53 p.m. UTC 
From: Alexander Shishkin <alexander.shishkin@linux.intel.com>

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@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 arch/x86/kernel/cpu/cpuid-deps.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c
index 98d0cdd82574..11bb9ed40140 100644
--- a/arch/x86/kernel/cpu/cpuid-deps.c
+++ b/arch/x86/kernel/cpu/cpuid-deps.c
@@ -90,6 +90,7 @@  static const struct cpuid_dep cpuid_deps[] = {
 	{ X86_FEATURE_FRED,			X86_FEATURE_LKGS      },
 	{ X86_FEATURE_SPEC_CTRL_SSBD,		X86_FEATURE_SPEC_CTRL },
 	{ X86_FEATURE_LASS,			X86_FEATURE_SMAP      },
+	{ X86_FEATURE_LAM,			X86_FEATURE_LASS      },
 	{}
 };