linux-kernel - Re: [PATCH v5 0/7] x86/boot: Remove run-time relocations from compressed kernel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CA+icZUUxE=+yq-NPitRBwJ-92cqEP6TXdf=kRiLTN09UQUAi2Q@mail.gmail.com>
Date:   Fri, 17 Jul 2020 20:21:12 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Fangrui Song <maskray@...gle.com>,
        Dmitry Golovin <dima@...ovin.in>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        "H . J . Lu" <hjl@...rceware.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 0/7] x86/boot: Remove run-time relocations from
 compressed kernel

On Fri, Jul 17, 2020 at 8:17 PM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> On Fri, Jul 17, 2020 at 6:46 AM Arvind Sankar <nivedita@...m.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 -