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References: <20191205000957.112719-1-thgarnie@chromium.org> <20191219133452.GM2827@hirez.programming.kicks-ass.net>
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From:   Thomas Garnier <thgarnie@chromium.org>
Date:   Thu, 19 Dec 2019 08:35:25 -0800
Message-ID: <CAJcbSZEubkFN0BLugoBm8fsPrNWxfFCDytC3nYUepr74dQFS=w@mail.gmail.com>
Subject: Re: [PATCH v10 00/11] x86: PIE support to extend KASLR randomization
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Kernel Hardening <kernel-hardening@lists.openwall.com>,
        Kristen Carlson Accardi <kristen@linux.intel.com>,
        Kees Cook <keescook@chromium.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        Andy Lutomirski <luto@kernel.org>,
        Juergen Gross <jgross@suse.com>,
        Thomas Hellstrom <thellstrom@vmware.com>,
        "VMware, Inc." <pv-drivers@vmware.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
        Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        Will Deacon <will@kernel.org>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Jiri Slaby <jslaby@suse.cz>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Alexios Zavras <alexios.zavras@intel.com>,
        Allison Randal <allison@lohutok.net>,
        Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
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On Thu, Dec 19, 2019 at 5:35 AM Peter Zijlstra <peterz@infradead.org> wrote:
>
> On Wed, Dec 04, 2019 at 04:09:37PM -0800, Thomas Garnier wrote:
> > Minor changes based on feedback and rebase from v9.
> >
> > Splitting the previous serie in two. This part contains assembly code
> > changes required for PIE but without any direct dependencies with the
> > rest of the patchset.
>
> ISTR suggestion you add an objtool pass that verifies there are no
> absolute text references left. Otherwise we'll forever be chasing that
> last one..

Correct, I have a reference in the changelog saying I will tackle in
the next patchset because we still have non-pie references in other
places but the fix is a bit more complex (for exemple per-cpu) and not
included in this phase. I will add a better explanation in the next
message for patch v11.