Hi all, With Spectre variant 2 (CVE-2017-5715), gcc has been updated to avoid branch prediction problems via the retpoline patch. Specifically, by using either -mindirect-branch=thunk-inline or -mindirect-branch=thunk or -mindirect-branch-thunk-external, the compiler will convert indirect branches and function returns to call and return thunks thus avoiding speculative execution in those cases. Of course, there is a performance penalty depending on the exact argument used. Has anyone compiled uclibc with one of those switches?
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