linux-kernel - Re: Building arm64 EFI stub with -fpie breaks build of 4.9.x (undefined reference to `__efistub__GLOBAL_OFFSET_TABLE

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Date:   Fri, 02 Aug 2019 10:16:23 +0200
From:   Rolf Eike Beer <eb@...ix.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-efi@...r.kernel.org,
        Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
        stable@...r.kernel.org, Matthias Kaehlcke <mka@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: Building arm64 EFI stub with -fpie breaks build of 4.9.x (undefined reference to `__efistub__GLOBAL_OFFSET_TABLE_')

Nathan Chancellor wrote:
> On Fri, Aug 02, 2019 at 09:57:45AM +0200, Greg KH wrote:
> > On Thu, Jun 06, 2019 at 09:11:00AM +0200, Rolf Eike Beer wrote:
> > > Nick Desaulniers wrote:
> > > > On Wed, Jun 5, 2019 at 10:27 AM Nick Desaulniers
> > > > 
> > > > <ndesaulniers@...gle.com> wrote:
> > > > > On Wed, Jun 5, 2019 at 9:26 AM Greg KH <gregkh@...uxfoundation.org> 
wrote:
> > > > > > On Wed, Jun 05, 2019 at 05:19:40PM +0200, Rolf Eike Beer wrote:
> > > > > > > I decided to dig out a toy project which uses a DragonBoard
> > > > > > > 410c. This
> > > > > > > has
> > > > > > > been "running" with kernel 4.9, which I would keep this way for
> > > > > > > unrelated
> > > > > > > reasons. The vanilla 4.9 kernel wasn't bootable back then, but
> > > > > > > it was
> > > > > > > buildable, which was good enough.
> > > > > > > 
> > > > > > > Upgrading the kernel to 4.9.180 caused the boot to suddenly
> > > > > > > fail:
> > > > > > > 
> > > > > > > aarch64-unknown-linux-gnueabi-ld:
> > > > > > > ./drivers/firmware/efi/libstub/lib.a(arm64- stub.stub.o): in
> > > > > > > function
> > > > > > > `handle_kernel_image':
> > > > > > > /tmp/e2/build/linux-4.9.139/drivers/firmware/efi/libstub/arm64-s
> > > > > > > tub.c:
> > > > > > > 63:
> > > > > > > undefined reference to `__efistub__GLOBAL_OFFSET_TABLE_'
> > > > > > > aarch64-unknown-linux-gnueabi-ld:
> > > > > > > ./drivers/firmware/efi/libstub/lib.a(arm64- stub.stub.o):
> > > > > > > relocation
> > > > > > > R_AARCH64_ADR_PREL_PG_HI21 against symbol
> > > > > > > `__efistub__GLOBAL_OFFSET_TABLE_' which may bind externally can
> > > > > > > not
> > > > > > > be used when making a shared object; recompile with -fPIC
> > > > > > > /tmp/e2/build/linux-4.9.139/drivers/firmware/efi/libstub/arm64-s
> > > > > > > tub.c:
> > > > > > > 63:
> > > > > > > (.init.text+0xc): dangerous relocation: unsupported relocation
> > > > > > > /tmp/e2/build/linux-4.9.139/Makefile:1001: recipe for target
> > > > > > > 'vmlinux'
> > > > > > > failed -make[1]: *** [vmlinux] Error 1
> > > > > > > 
> > > > > > > This is caused by commit
> > > > > > > 27b5ebf61818749b3568354c64a8ec2d9cd5ecca from
> > > > > > > linux-4.9.y (which is 91ee5b21ee026c49e4e7483de69b55b8b47042be),
> > > > > > > reverting
> > > > > > > this commit fixes the build.

> > Did this ever get resolved, or is it still an issue?
> 
> This appears to have been resolved by commit 8fca3c364683 ("efi/libstub:
> Unify command line param parsing") in 4.9.181. I can build defconfig +
> CONFIG_RANDOMIZE_BASE without any issues.

I can confirm that 4.9.186 builds without issues with my original config.

Thanks for paying attention.

Eike
-- 
Rolf Eike Beer, emlix GmbH, http://www.emlix.com
Fon +49 551 30664-0, Fax +49 551 30664-11
Gothaer Platz 3, 37083 Göttingen, Germany
Sitz der Gesellschaft: Göttingen, Amtsgericht Göttingen HR B 3160
Geschäftsführung: Heike Jordan, Dr. Uwe Kracke – Ust-IdNr.: DE 205 198 055

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