linux-kernel - Re: [PATCH] Documentation/changes: Raise minimum supported binutils version to 2.23

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Date:   Tue, 24 Mar 2020 11:38:48 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>, Borislav Petkov <bp@...en8.de>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, X86 ML <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Lendacky <Thomas.Lendacky@....com>,
        Mauro Rossi <issor.oruam@...il.com>,
        Michael Matz <matz@...e.de>
Subject: Re: [PATCH] Documentation/changes: Raise minimum supported binutils
 version to 2.23

On Tue, Mar 24, 2020 at 06:12:01PM +0900, Masahiro Yamada wrote:
> On Tue, Mar 24, 2020 at 6:02 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
> >
> > Hi.
> >
> >
> >
> > On Tue, Mar 24, 2020 at 5:51 AM Kees Cook <keescook@...omium.org> wrote:
> > >
> > > On Mon, Mar 23, 2020 at 02:44:54PM -0600, Jason A. Donenfeld wrote:
> > > > On Mon, Mar 16, 2020 at 05:02:59PM +0100, Borislav Petkov wrote:
> > > > > Long overdue patch, see below.
> > > > >
> > > > > Plan is to queue it after 5.7-rc1.
> > > > >
> > > > > ---
> > > > > From: Borislav Petkov <bp@...e.de>
> > > > > Date: Mon, 16 Mar 2020 16:28:36 +0100
> > > > > Subject: [PATCH] Documentation/changes: Raise minimum supported binutilsa version to 2.23
> > > > >
> > > > > The currently minimum-supported binutils version 2.21 has the problem of
> > > > > promoting symbols which are defined outside of a section into absolute.
> > > > > According to Arvind:
> > > > >
> > > > >   binutils-2.21 and -2.22. An x86-64 defconfig will fail with
> > > > >           Invalid absolute R_X86_64_32S relocation: _etext
> > > > >   and after fixing that one, with
> > > > >           Invalid absolute R_X86_64_32S relocation: __end_of_kernel_reserve
> > > > >
> > > > > Those two versions of binutils have a bug when it comes to handling
> > > > > symbols defined outside of a section and binutils 2.23 has the proper
> > > > > fix, see: https://sourceware.org/legacy-ml/binutils/2012-06/msg00155.html
> 
> 
> This seems to be also related to
> 7883a14339299773b2ce08dcfd97c63c199a9289
> 
> 
> I had noticed the symbol "_text"
> was absolute on binutils <= 2.22,
> but I was not sure whether it was a bug of the tool.
> 
> I applied the fix.
> Perhaps, it was unneeded given that
> we require the binutils 2.23
> 

Which architecture? x86 at least doesn't even build with <= 2.22, but
adding workarounds for that shows _text as section-relative (T in nm
output).