linux-kernel - [PATCH v2 0/2] vdso: Work around and reject absolute relocations

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Message-Id: <20250430-vdso-absolute-reloc-v2-0-5efcc3bc4b26@linutronix.de>
Date: Wed, 30 Apr 2025 11:20:12 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, Nam Cao <namcao@...utronix.de>, 
 Anna-Maria Behnsen <anna-maria@...utronix.de>, 
 Thomas Gleixner <tglx@...utronix.de>, Andy Lutomirski <luto@...nel.org>, 
 Vincenzo Frascino <vincenzo.frascino@....com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Jan Stancek <jstancek@...hat.com>, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v2 0/2] vdso: Work around and reject absolute relocations

GCC on arm64 would incorrectly emit absolute relocations in vDSO code.
Work around those and break the build if new ones appear.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
Changes in v2:
- Link to openend (invalid) GCC bug containing more explanations
- Refine commit messages
- Don't fail on commit absolute relocations in debug info
- Link to v1: https://lore.kernel.org/r/20250429-vdso-absolute-reloc-v1-0-987a0afd10b5@linutronix.de

---
Thomas Weißschuh (2):
      arm64: vdso: Work around invalid absolute relocations from GCC
      vdso: Reject absolute relocations during build

 arch/arm64/include/asm/vdso/gettimeofday.h | 13 +++++++++++++
 lib/vdso/Makefile.include                  |  6 ++++++
 2 files changed, 19 insertions(+)
---
base-commit: b4432656b36e5cc1d50a1f2dc15357543add530e
change-id: 20250428-vdso-absolute-reloc-a226293c1761

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@...utronix.de>