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

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Message-ID: <CA+55aFz5Z-9RDOyQhj-oNVQdrfmW_tXPhOqCK7M8nBnUjAVrPw@mail.gmail.com>
Date:   Fri, 17 Nov 2017 21:29:15 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Patrick McLean <chutzpah@...too.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 Fri, Nov 17, 2017 at 9:14 PM, Kees Cook <keescook@...omium.org> wrote:
>
> FWIW, myself doing a build at d9e12200852d with and without
> GCC_PLUGIN_RANDSTRUCT _appears_ to produce identical objdump output
> where I did spot-checks.

That would probably be a good thing to check anyway - check the
difference between GCC_PLUGIN_RANDSTRUCT on and off at that commit.

Just do

   objdump --disassemble vmlinux > file

and compare the two files for where the differences start occurring.

                 Linus