linux-kernel - Re: [PATCH v4 0/4] SROP Mitigation: Sigreturn Cookies

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Message-ID: <CA+55aFx_4a245DQ-9=rW4reJ_Qa-+sZ3QG840kyVmcG8ebdEBg@mail.gmail.com>
Date:	Tue, 29 Mar 2016 17:55:40 -0500
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Scott Bauer <sbauer@....utah.edu>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, wmealing@...hat.com
Subject: Re: [PATCH v4 0/4] SROP Mitigation: Sigreturn Cookies

On Tue, Mar 29, 2016 at 5:54 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> So you could do 4 32
>
>  - the random value
>  - the low 32 bits of the address of the cookie
>  - the low 32 bits of the return point stack and instruction pointer

Oops, editing mishap. That was supposed to be about the 128-bit md5
chunk, which uses 4 32-bit values, but then I edited things and didn't
get back to it.

                Linus