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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Message-ID: <8696846.WsthzzWoxp@devpool35>
Date:   Thu, 06 Jun 2019 09:38:41 +0200
From:   Rolf Eike Beer <eb@...ix.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     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
Subject: Re: Building arm64 EFI stub with -fpie breaks build of 4.9.x (undefined reference to `__efistub__GLOBAL_OFFSET_TABLE_')

Greg KH 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-stub.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-stub.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.
> > 
> > This happens with vanilla binutils 2.32 and gcc 8.3.0 as well as 9.1.0.
> > See
> > the attached .config for reference.
> > 
> > If you have questions or patches just ping me.
> 
> Does Linus's latest tree also fail for you (or 5.1)?

5.1.7 with the same config as before and "make olddefconfig" builds for me.

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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