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CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY: Mitigate Spectre style attacks against branch history

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The Linux kernel configuration item CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY:

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Speculation attacks against some high-performance processors can make use of branch history to influence future speculation. When taking an exception from user-space, a sequence of branches or a firmware call overwrites the branch history.



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