On Sun, 2018-01-21 at 20:01 +0100, Borislav Petkov wrote: > > so execution runs directly into the MSR write and the JMP is gone. > > So I don't see indirect branches anywhere...
Wait until the wind changes. Congratulations, you've just turned a potential GCC missed optimisation into a kernel bug. We don't *care* that it's unlikely that GCC will miss that optimisation. The point is that it doesn't *have* to do it, and we don't *check*. cf. https://lkml.org/lkml/2018/1/12/176 ... after which Peter went off and implemented that check, which is all fine and dandy but let's not rely on backporting that too.
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