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| author | Daniel Sneddon <daniel.sneddon@linux.intel.com> | 2024-03-13 17:47:57 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-04-08 19:27:05 +0200 |
| commit | 0f4a837615ff925ba62648d280a861adf1582df7 (patch) | |
| tree | 0dfeef27c4dbffd6e2b9afa52a5809cd92a244ae /arch/x86/Kconfig | |
| parent | x86/bhi: Add support for clearing branch history at syscall entry (diff) | |
| download | linux-0f4a837615ff925ba62648d280a861adf1582df7.tar.xz linux-0f4a837615ff925ba62648d280a861adf1582df7.zip | |
x86/bhi: Define SPEC_CTRL_BHI_DIS_S
Newer processors supports a hardware control BHI_DIS_S to mitigate
Branch History Injection (BHI). Setting BHI_DIS_S protects the kernel
from userspace BHI attacks without having to manually overwrite the
branch history.
Define MSR_SPEC_CTRL bit BHI_DIS_S and its enumeration CPUID.BHI_CTRL.
Mitigation is enabled later.
Signed-off-by: Daniel Sneddon <daniel.sneddon@linux.intel.com>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Daniel Sneddon <daniel.sneddon@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Diffstat (limited to 'arch/x86/Kconfig')
0 files changed, 0 insertions, 0 deletions