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SubjectRe: [PATCH v4 07/10] x86: narrow out of bounds syscalls to sys_read under speculation
On Tue, Feb 6, 2018 at 12:49 PM, Andy Lutomirski <> wrote:
> Can you use @cc to make an asm statement that outputs both the masked
> array index and the "if" condition? I can never remember the syntax,
> but something like:

Yes. Although I'd actually suggest just using an "asm goto" if we
really want to optimize this. Give the "index_mask_nospec()" a third
argument that is the label to jump to for overflow.

Then you can just decide how to implement it best for any particular
architecture (and compiler limitation).


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