Re: [PATCH 2/2] x86_64,signal: Remove 'fs' and 'gs' from sigcontext

From: H. Peter Anvin
Date: Sat Jul 12 2014 - 14:40:49 EST

Because you are doing something weird (like Pin, for example) and take an asynchronous fault?

On July 12, 2014 11:37:48 AM PDT, Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:
>> This seems like it's asking for trouble. I think wxe'd have to
>> separately save the selectors and the base registers to avoid
>> something, especially once wrgsbase, etc are enabled.
>I agree, it would likely break existing code.
>> Linus, for context, the other patch in this series saves and restores
>> SS.
>> Without that, 64-bit sigreturn to a nondefault stack segment is
>> basically impossible.
>Why would you ever want to do that?

Sent from my mobile phone. Please pardon brevity and lack of formatting.
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