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Date:   Thu, 5 Apr 2018 09:08:10 +0200
From:   Peter Zijlstra <>
To:     James Y Knight <>
Cc:     Linus Torvalds <>,,
        Nick Desaulniers <>,,
        Ingo Molnar <>,
        Linux Kernel Mailing List <>,, Andrew Morton <>,
        Chandler Carruth <>,
        Stephen Hines <>,
        Kees Cook <>,,
        Greg Hackmann <>
Subject: Re: [GIT PULL] x86/build changes for v4.17

On Wed, Apr 04, 2018 at 10:21:05PM +0000, James Y Knight wrote:
> But allowing random pointer arithmetic, and pointer arithmetic wraparound,
> is still different than asserting that an object _field access_ can
> overflow. Clang does not believe that can happen -- it assumes that an
> object will still be contiguous. And that's why the llist stuff used to be
> broken, before it was corrected to do simply do math on a uintptr_t (which
> is a nice and simple and sane fix!).

That 'fix' wasn't anything simple, I recently ran into that
member_address_is_nonnull() trainwreck and had to think real hard wtf it
was about.

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