linux-kernel - Re: [PATCH] x86/tools/relocs: Add _etext and __end_of_kernel_reserve to S

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Date:   Mon, 13 Jan 2020 23:17:25 -0500
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Thomas Lendacky <Thomas.Lendacky@....com>,
        Michael Matz <matz@...e.de>
Subject: Re: [PATCH] x86/tools/relocs: Add _etext and __end_of_kernel_reserve
 to S_REL

On Mon, Jan 13, 2020 at 07:08:26PM +0100, Borislav Petkov wrote:
> On Mon, Jan 13, 2020 at 12:59:38PM -0500, Arvind Sankar wrote:
> > How is "breaks with binutils before version 2.23" not clear enough? It
> 
> Nevermind, I'll write it myself if/when I end up applying some version
> of it. I've wasted enough time trying to get my point across.
> 

You're wasting time, because you're not _listening_ to the other guy.
There is nothing special about how to repro this bug. It can be repro'd
by building binutils-2.21.1 from source, it can be repro'd by building
with a distro that packaged 2.21 -- such as OpenSUSE 12.1 [1], it can be
repro'd by Mauro doing an Android build [2].

The common thread in all that, is that the kernel is being built with a
binutils prior to version 2.23, which is what is noted in the commit log
as it stands.

[1] https://lore.kernel.org/lkml/20200113233829.GB2000869@rani.riverdale.lan/
[2] https://lore.kernel.org/lkml/CAEQFVGbWKf2ksMrMmtymewArSF=ztNgeuieEQ3wvKrX1r759Aw@mail.gmail.com/