diff mbox series

[v4,16/16] x86/cpu: Make LAM depend on LASS

Message ID 20240710160655.3402786-17-alexander.shishkin@linux.intel.com
State New
Headers show
Series Enable Linear Address Space Separation support | expand

Commit Message

Alexander Shishkin July 10, 2024, 4:06 p.m. UTC 
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>
---
 arch/x86/kernel/cpu/cpuid-deps.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c
index 22612e01ec2e..8986e990beb0 100644
--- a/arch/x86/kernel/cpu/cpuid-deps.c
+++ b/arch/x86/kernel/cpu/cpuid-deps.c
@@ -85,6 +85,7 @@  static const struct cpuid_dep cpuid_deps[] = {
 	{ X86_FEATURE_FRED,			X86_FEATURE_LKGS      },
 	{ X86_FEATURE_FRED,			X86_FEATURE_WRMSRNS   },
 	{ X86_FEATURE_LASS,			X86_FEATURE_SMAP      },
+	{ X86_FEATURE_LAM,			X86_FEATURE_LASS      },
 	{}
 };