linux-kernel - Re: [nfsd4] potentially hardware breaking regression in 4.14-rc and 4.13.11

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Date:   Fri, 17 Nov 2017 17:54:03 -0800
From:   Patrick McLean <chutzpah@...too.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Emese Revfy <re.emese@...il.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Bruce Fields <bfields@...hat.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Thorsten Leemhuis <regressions@...mhuis.info>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>
Subject: Re: [nfsd4] potentially hardware breaking regression in 4.14-rc and
 4.13.11



On 2017-11-17 04:55 PM, Linus Torvalds wrote:
> On Fri, Nov 17, 2017 at 4:27 PM, Patrick McLean <chutzpah@...too.org> wrote:
>>
>> I am still getting the crash at d9e12200852d, I figured I would
>> double-check the "good" and "bad" kernels before starting a full bisect.
> 
> .. but without GCC_PLUGIN_RANDSTRUCT it's solid?

Yes, without GCC_PLUGIN_RANDSTRUCT it's solid.

> Kees removed even the baseline "randomize pure function pointer
> structures", so at that commit, nothing should be randomized.
> 
> But maybe the plugin code itself ends up confusing gcc somehow?
> 
> Even when it doesn't actually do that "relayout_struct()" on the
> structure, it always does those TYPE_ATTRIBUTES() games.