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Date: Tue, 9 Feb 2016 12:45:54 -0800
From: Andi Kleen <>
To: Andy Lutomirski <>
Cc: Scotty Bauer <>,
	Mika Penttilä <>,
	"" <>,
	"" <>,
	X86 ML <>, Ingo Molnar <>,
	Thomas Gleixner <>,
	Abhiram Balasubramanian <>
Subject: Re: [PATCHv2 2/2] x86: SROP mitigation: implement signal cookies

> Is this compatible with existing userspace?  CRIU and DOSEMU seem like
> things that are likely to blow up to me.

It should at least make it a sysctl.

> We may need to make this type of mitigation be opt-in.  I'm already
> vaguely planning an opt-in mitigation framework for vsyscall runtime
> disablement, and this could use the same opt-in mechanism.

Generally asking people to rely on frame works that don't exist
is not good review feedback.

-- -- Speaking for myself only

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