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SubjectRe: [PATCH] x86/asm/entry/64: better check for canonical address
On Tue, Apr 21, 2015 at 9:27 AM, Denys Vlasenko <> wrote:
> This change makes the check exact (no more false positives
> on "negative" addresses).

Acked-by: Andy Lutomirski <>

I'll take a full implementation of what Intel says over probably
unmeasurable performance. If anyone in the AMD camp really cared, we
could add X86_BUG_SYSRET_NEEDS_CANONICAL_RCX and use alternatives to
patch this out on AMD. I doubt this would buy us much.


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