linux-kernel - Re: [PATCH] x86/build: Move _etext to actual end of .text

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Date:   Thu, 16 May 2019 15:56:07 +0200
From:   Johannes Hirte <johannes.hirte@...enkhaos.de>
To:     Kees Cook <keescook@...omium.org>
Cc:     Borislav Petkov <bp@...e.de>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH] x86/build: Move _etext to actual end of .text

On 2019 Mai 15, Kees Cook wrote:
> On Tue, May 14, 2019 at 06:10:55PM +0200, Johannes Hirte wrote:
> > On 2019 Mai 14, Kees Cook wrote:
> > > On Tue, May 14, 2019 at 02:04:21PM +0200, Johannes Hirte wrote:
> > > > This breaks the build on my system:
> > > > 
> > > >   RELOCS  arch/x86/boot/compressed/vmlinux.relocs
> > > >   CC      arch/x86/boot/compressed/early_serial_console.o
> > > >   CC      arch/x86/boot/compressed/kaslr.o
> > > >   AS      arch/x86/boot/compressed/mem_encrypt.o
> > > >   CC      arch/x86/boot/compressed/kaslr_64.o
> > > > Invalid absolute R_X86_64_32S relocation: _etext
> > > > make[2]: *** [arch/x86/boot/compressed/Makefile:130: arch/x86/boot/compressed/vmlinux.relocs] Error 1
> > > > make[2]: *** Deleting file 'arch/x86/boot/compressed/vmlinux.relocs'
> > > > make[2]: *** Waiting for unfinished jobs....
> > > > make[1]: *** [arch/x86/boot/Makefile:112: arch/x86/boot/compressed/vmlinux] Error 2
> > > > make: *** [arch/x86/Makefile:283: bzImage] Error 2
> > > 
> > > Interesting! Can you send along your .config and compiler details?
> > 
> > Tested with gcc-8.3 and gcc-9.1, both the same result.
> > [...]
> > gcc version 8.3.0 (Gentoo 8.3.0-r1 p1.1)
> 
> Hm, I'm not able to reproduce this with any of the compilers I have
> access to. The most recent I have is:
> 
> gcc (Ubuntu 20180425-1ubuntu1) 9.0.0 20180425 (experimental) [trunk revision 259645]
> 
> Various stupid questions: did you wipe the whole bulid tree and start
> clean? 

No I didn't. And this fixed it now. After a distclean I'm unable to
reproduce it. So sorry for the noise.

-- 
Regards,
  Johannes