linux-kernel - Re: [PATCH v3 1/7] x86/boot/compressed: Move .got.plt entries out of the .got section

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Message-ID: <202006290909.F79ED275C@keescook>
Date:   Mon, 29 Jun 2020 09:10:04 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Ard Biesheuvel <ardb@...nel.org>
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>, X86 ML <x86@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Fangrui Song <maskray@...gle.com>,
        Dmitry Golovin <dima@...ovin.in>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        "H . J . Lu" <hjl@...rceware.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/7] x86/boot/compressed: Move .got.plt entries out of
 the .got section

On Mon, Jun 29, 2020 at 05:51:00PM +0200, Ard Biesheuvel wrote:
> On Mon, 29 Jun 2020 at 17:50, Arvind Sankar <nivedita@...m.mit.edu> wrote:
> >
> > On Mon, Jun 29, 2020 at 08:48:05AM -0700, Kees Cook wrote:
> > > On Mon, Jun 29, 2020 at 10:09:22AM -0400, Arvind Sankar wrote:
> > >
> > > This is also being done on arm64, and the section was specified slightly
> > > differently (with INFO) which maybe should be done here too?
> >
> > I was actually just about to email you to ask what that INFO is for :)
> > What does it do?
> >
> 
> It makes the section non-allocatable, so it is dropped from the final image

i.e. takes no disk space, but the ASSERT can still be done.

-- 
Kees Cook