linux-kernel - Re: [PATCH 2/4] x86: SROP mitigation: implement signal canaries

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Date:	Fri, 16 May 2014 18:03:01 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Erik Bosman <erik@...emu.org>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] x86: SROP mitigation: implement signal canaries

> Hrmz.. FP state is aligned on a 64 byte boundary, the signal frame (separately)
> on a 16 byte-sizeof(long) boundary.  But it looks like that for 32 and 64 bit
> rt_sigreturn this means no padding :-/

There may be some unused bytes in the existing structures, perhaps not
continuous.

-Andi
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