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Date: Tue, 20 Feb 2018 15:33:49 -0800
From: Laura Abbott <>
To: Kees Cook <>, Alexander Popov
 <>, Thomas Gleixner <>,
 Andy Lutomirski <>
Cc: Kernel Hardening <>,
 PaX Team <>, Brad Spengler <>,
 Ingo Molnar <>, Tycho Andersen <>,
 Mark Rutland <>,
 Ard Biesheuvel <>, Borislav Petkov <>,
 "H . Peter Anvin" <>, Peter Zijlstra <>,
 "Dmitry V . Levin" <>, X86 ML <>,
 Mohamed Ghannam <>
Subject: Re: [PATCH RFC v8 0/6] Introduce the STACKLEAK feature and a test for

On 02/20/2018 03:17 PM, Kees Cook wrote:
> On Tue, Feb 20, 2018 at 2:29 AM, Alexander Popov <> wrote:
>> On 16.02.2018 21:10, Alexander Popov wrote:
>>> This is the 8th version of the patch series introducing STACKLEAK to the
>>> mainline kernel. I've made some minor improvements while waiting for the
>>> next review by x86 maintainers.
> If we can borrow some of luto or tglx's time, I think that'd be best:
> they've been looking at the entry code a lot lately. :) Regardless, I
> think the addition to the entry code is clean (especially now that the
> fast path is gone *sob*). :P
>>> STACKLEAK is a security feature developed by Grsecurity/PaX (kudos to them),
>>> which:
>>>   - reduces the information that can be revealed through kernel stack leak bugs;
>>>   - blocks some uninitialized stack variable attacks (e.g. CVE-2010-2963);
>>>   - introduces some runtime checks for kernel stack overflow detection.
> I've added this series to my trees, which means 0-day will
> start grinding on it too now:
> kspp/gcc-plugin/stackleak
> The LKDTM tests look great and check out for me. I think the code is
> clear, so I'd like to get it into -next, but I want to be sure I'm not
> stepping on x86 toes first.
> Laura, how does arm64 look for this? Would it be possible to add it to
> this series (at least on for build/run testing)?

I fell behind on rebasing/testing so I need to bring it up to date.
Assuming the arm folks are okay with the approach, we can bring it
in for testing once I'm finished.


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