linux-kernel - [PATCH v3 0/3] vdso: Reject absolute relocations during build

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Message-Id: <20250611-vdso-absolute-reloc-v3-0-47897d73784b@linutronix.de>
Date: Wed, 11 Jun 2025 11:22:11 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>, Nathan Chancellor <nathan@...nel.org>, 
 Nick Desaulniers <nick.desaulniers+lkml@...il.com>, 
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
 Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Vincenzo Frascino <vincenzo.frascino@....com>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 llvm@...ts.linux.dev, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v3 0/3] vdso: Reject absolute relocations during build

The compiler can emit absolute relocations in vDSO code,
which are invalid in vDSO code.
Detect them at compile-time.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
Changes in v3:
- Drop already applied bugfix for arm64
- Disable LTO for the riscv vDSO, as it is incompatible
- Link to v2: https://lore.kernel.org/r/20250430-vdso-absolute-reloc-v2-0-5efcc3bc4b26@linutronix.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 (3):
      riscv: vdso: Deduplicate CFLAGS_REMOVE_* variables
      riscv: vdso: Disable LTO for the vDSO
      vdso: Reject absolute relocations during build

 arch/riscv/kernel/vdso/Makefile | 7 ++++---
 lib/vdso/Makefile.include       | 6 ++++++
 2 files changed, 10 insertions(+), 3 deletions(-)
---
base-commit: 13a2ea925ad717de32b5aeaaccda62ed26146d9f
change-id: 20250428-vdso-absolute-reloc-a226293c1761

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