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| author | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2022-02-10 16:05:45 +0000 |
|---|---|---|
| committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2022-03-05 10:42:07 +0000 |
| commit | b9baf5c8c5c356757f4f9d8180b5e9d234065bc3 (patch) | |
| tree | d5a219c88d8888508c947a84a86df32a941887a3 /arch/arm/mm/Kconfig | |
| parent | 8d9d651ff2270a632e9dc497b142db31e8911315 (diff) | |
| download | linux-b9baf5c8c5c356757f4f9d8180b5e9d234065bc3.tar.gz linux-b9baf5c8c5c356757f4f9d8180b5e9d234065bc3.tar.bz2 linux-b9baf5c8c5c356757f4f9d8180b5e9d234065bc3.zip | |
ARM: Spectre-BHB workaround
Workaround the Spectre BHB issues for Cortex-A15, Cortex-A57,
Cortex-A72, Cortex-A73 and Cortex-A75. We also include Brahma B15 as
well to be safe, which is affected by Spectre V2 in the same ways as
Cortex-A15.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/mm/Kconfig')
| -rw-r--r-- | arch/arm/mm/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 850329ea9bf8..9724c16e9076 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -851,6 +851,16 @@ config HARDEN_BRANCH_PREDICTOR If unsure, say Y. +config HARDEN_BRANCH_HISTORY + bool "Harden Spectre style attacks against branch history" if EXPERT + depends on CPU_SPECTRE + default y + help + Speculation attacks against some high-performance processors can + make use of branch history to influence future speculation. When + taking an exception, a sequence of branches overwrites the branch + history, or branch history is invalidated. + config TLS_REG_EMUL bool select NEED_KUSER_HELPERS |