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From: Thomas Gleixner <tglx@linutronix.de>
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To: Jan Stancek <jstancek@redhat.com>, Thomas =?utf-8?Q?Wei=C3=9Fschuh?=
 <thomas.weissschuh@linutronix.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon
 <will@kernel.org>, Nam Cao <namcao@linutronix.de>, Anna-Maria Behnsen
 <anna-maria@linutronix.de>, Andy Lutomirski <luto@kernel.org>, Vincenzo
 Frascino <vincenzo.frascino@arm.com>,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] vdso: Reject absolute relocations during build
In-Reply-To: <CAASaF6yGT0pDythQ9nTcn5=MHmLYD=gCNVc6dFXhWUO_iXJXqA@mail.gmail.com>
References: <20250429-vdso-absolute-reloc-v1-0-987a0afd10b5@linutronix.de>
 <20250429-vdso-absolute-reloc-v1-2-987a0afd10b5@linutronix.de>
 <CAASaF6yGT0pDythQ9nTcn5=MHmLYD=gCNVc6dFXhWUO_iXJXqA@mail.gmail.com>
Date: Wed, 30 Apr 2025 09:32:27 +0200
Message-ID: <87selqp0j8.ffs@tglx>
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On Tue, Apr 29 2025 at 17:17, Jan Stancek wrote:
> On Tue, Apr 29, 2025 at 2:56=E2=80=AFPM Thomas Wei=C3=9Fschuh
> <thomas.weissschuh@linutronix.de> wrote:
>>
>> +# Also validate that no absolute relocations are present in the object =
files themselves.
>>  quiet_cmd_vdso_check =3D VDSOCHK $@
>>        cmd_vdso_check =3D if $(READELF) -rW $@ | grep -v _NONE | grep -q=
 " R_\w*_"; \
>>                        then (echo >&2 "$@: dynamic relocations are not s=
upported"; \
>> +                            rm -f $@; /bin/false); fi && \
>> +                      if $(READELF) -rW $(filter %.o, $(real-prereqs)) =
| grep -q " R_\w*_ABS"; \
>> +                      then (echo >&2 "$@: absolute relocations are not =
supported"; \
>>                              rm -f $@; /bin/false); fi
>
> Should this check only some sections? I'm getting lot of matches on
> debuginfo related sections:

Hmm. All architecture VDSO Makefiles have -fPIC in CFLAGS except for
arm64, which only adds it in arm64/kernel/vdso32/Makefile but not in
arm64/kernel/vdso/Makefile. Confused.

Thanks,

        tglx