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Reply-To: sedat.dilek@gmail.com
From:   Sedat Dilek <sedat.dilek@gmail.com>
Date:   Fri, 17 Jul 2020 20:21:12 +0200
Message-ID: <CA+icZUUxE=+yq-NPitRBwJ-92cqEP6TXdf=kRiLTN09UQUAi2Q@mail.gmail.com>
Subject: Re: [PATCH v5 0/7] x86/boot: Remove run-time relocations from
 compressed kernel
To:     Nick Desaulniers <ndesaulniers@google.com>
Cc:     Arvind Sankar <nivedita@alum.mit.edu>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@kernel.org>,
        Fangrui Song <maskray@google.com>,
        Dmitry Golovin <dima@golovin.in>,
        clang-built-linux <clang-built-linux@googlegroups.com>,
        Ard Biesheuvel <ardb@kernel.org>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Nathan Chancellor <natechancellor@gmail.com>,
        Arnd Bergmann <arnd@arndb.de>,
        "H . J . Lu" <hjl@sourceware.org>,
        LKML <linux-kernel@vger.kernel.org>
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On Fri, Jul 17, 2020 at 8:17 PM Nick Desaulniers
<ndesaulniers@google.com> wrote:
>
> On Fri, Jul 17, 2020 at 6:46 AM Arvind Sankar <nivedita@alum.mit.edu> wrote:
> >
> > On Tue, Jul 14, 2020 at 08:41:26PM -0400, Arvind Sankar wrote:
> > > The compressed kernel currently contains bogus run-time relocations in
> > > the startup code in head_{32,64}.S, which are generated by the linker,
> > > but must not actually be processed at run-time.
> > >
> > > This generates warnings when linking with the BFD linker, and errors
> > > with LLD, which defaults to erroring on run-time relocations in read-only
> > > sections. It also requires the -z noreloc-overflow hack for the 64-bit
> > > kernel, which prevents us from linking it as -pie on an older BFD linker
> > > (<= 2.26) or on LLD, because the locations that are to be apparently
> > > relocated are only 32-bits in size and so cannot really have
> > > R_X86_64_RELATIVE relocations.
> > >
> > > This series aims to get rid of these relocations. I've build- and
> > > boot-tested with combinations of clang/gcc-10 with lld/bfd-2.34, and
> > > gcc-4.9.0 with bfd-2.24, skipping clang on 32-bit because it currently
> > > has other issues [0].
> > >
> >
> > Hi Thomas, Ingo, Borislav, would you be able to take a look over this
> > series in time for 5.9?
>
> Hi Arvind, thanks for the series; I'm behind on testing.  When I try
> to apply this series on top of linux-next, I get a collision in
> drivers/firmware/efi/libstub/Makefile:27 when applying "0002
> x86/boot/compressed: Force hidden visibility for all symbol
> references". Would you mind refreshing the series to avoid that
> collision?
>

I guess taking a Linux-next release as a new base is not a good idea.
With the next Linux-next release... new troubles.
Please, keep the base on recent Linux v5.8-rcX.

- Sedat -