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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 17 Nov 2017 21:29:15 -0800
Message-ID: <CA+55aFz5Z-9RDOyQhj-oNVQdrfmW_tXPhOqCK7M8nBnUjAVrPw@mail.gmail.com>
Subject: Re: [nfsd4] potentially hardware breaking regression in 4.14-rc and 4.13.11
To: Kees Cook <keescook@chromium.org>
Cc: Patrick McLean <chutzpah@gentoo.org>,
        Emese Revfy <re.emese@gmail.com>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Bruce Fields <bfields@redhat.com>,
        "Darrick J. Wong" <darrick.wong@oracle.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
        stable <stable@vger.kernel.org>,
        Thorsten Leemhuis <regressions@leemhuis.info>,
        "kernel-hardening@lists.openwall.com"
        <kernel-hardening@lists.openwall.com>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-nfs-owner@vger.kernel.org

On Fri, Nov 17, 2017 at 9:14 PM, Kees Cook <keescook@chromium.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