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SubjectRe: [PATCH] x86: pad assembly functions with INT3
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On May 14, 2018 11:54:05 PM PDT, Ingo Molnar <mingo@kernel.org> wrote:
>
>* hpa@zytor.com <hpa@zytor.com> wrote:
>
>> > I guess it won't try to speculatively execute the 'pad'
>instructions - but you
>> > can never really tell!
>> >
>> > David
>>
>> The CPU doesn't speculate down past an unconditional control
>transfer. Doing so
>> would be idiotic.
>
>I think, when it comes to speculative execution, our general
>expectation that CPUs
>don't do idiotic things got somewhat weakened in the past year or so
>...
>
>Thanks,
>
> Ingo

Sort-of-kind-of... the things that have cropped up were reasonable consequences of designing under a set of assumptions which turned out to be incorrect. Speculating through an unconditional control transfer did not make sense under those assumptions either.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.

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