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Message-Id: <20250812-vdso-absolute-reloc-v4-0-61a8b615e5ec@linutronix.de>
Date: Tue, 12 Aug 2025 07:44:13 +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>, Kees Cook <kees@...nel.org>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>, Richard Weinberger <richard@....at>,
Anton Ivanov <anton.ivanov@...bridgegreys.com>,
Johannes Berg <johannes@...solutions.net>,
Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
Madhavan Srinivasan <maddy@...ux.ibm.com>,
Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>,
Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
Björn Roy Baron <bjorn3_gh@...tonmail.com>,
Benno Lossin <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>,
Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
Danilo Krummrich <dakr@...nel.org>,
Nicolas Schier <nicolas.schier@...ux.dev>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
llvm@...ts.linux.dev, linux-mm@...ck.org, linux-um@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
loongarch@...ts.linux.dev, linux-s390@...r.kernel.org,
linux-mips@...r.kernel.org, rust-for-linux@...r.kernel.org,
linux-kbuild@...r.kernel.org, Jan Stancek <jstancek@...hat.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Alexandre Ghiti <alexghiti@...osinc.com>,
Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v4 00/24] 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.
libc elf.h is missing some of the relocation constants,
so make user of the kernels own UAPI headers instead.
Kbuild and Rust folks: This contains custom definitions of hostprog
bindgen and rust library commands.
These are currently only defined inside the subsystem directory.
Let me know if they should go into scripts/Makefile.host.
This will conflict with my SPARC64 generic vDSO patches [0].
If both end up being applied at the same time, please leave out commit
'vdso/vdsocheck: Drop the transitional kconfig option' from this series.
[0] https://lore.kernel.org/lkml/20250724-vdso-sparc64-generic-2-v1-0-e376a3bd24d1@linutronix.de/
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
Changes in v4:
- Replace the inline shell logic with a dedicated build-time tool
- Link to v3: https://lore.kernel.org/r/20250611-vdso-absolute-reloc-v3-0-47897d73784b@linutronix.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 (24):
elf, uapi: Add a header for relocation constants
x86/elf, um/x86/elf: Move relocation constants to UAPI
ARM: elf: Move relocation constants to UAPI
arm64: elf: Move relocation constants to UAPI
powerpc/elf: Move relocation constants to UAPI
riscv: elf: Move relocation constants to UAPI
LoongArch: Move relocation constants to UAPI
s390/elf: Move relocation constants to UAPI
MIPS: ELF: Move relocation constants to UAPI
tools headers UAPI: Sync ELF headers with the kernel sources
vdso: Add the vdsocheck tool
x86/vdso: Enable the vdsocheck tool
ARM: vdso: Enable the vdsocheck tool
arm64: vdso: Enable the vdsocheck tool
powerpc/elf: Add 32-bit REL16 relocation definitions
powerpc/vdso: Enable the vdsocheck tool
riscv: vdso: Deduplicate CFLAGS_REMOVE_* variables
riscv: vdso: Disable LTO for the vDSO
riscv: vdso: Enable the vdsocheck tool
LoongArch: vDSO: Enable the vdsocheck tool
s390/vdso: Enable the vdsocheck tool
MIPS: ELF: Add more PC-relative relocation definitions
MIPS: vdso: Enable the vdsocheck tool
vdso/vdsocheck: Drop the transitional kconfig option
arch/arm/include/asm/elf.h | 24 --
arch/arm/vdso/Makefile | 4 +-
arch/arm64/include/asm/elf.h | 55 ----
arch/arm64/kernel/vdso/Makefile | 4 +-
arch/loongarch/include/asm/elf.h | 100 ------
arch/loongarch/vdso/Makefile | 4 +-
arch/mips/include/asm/elf.h | 53 ---
arch/mips/vdso/Makefile | 8 +-
arch/powerpc/include/uapi/asm/elf.h | 201 ------------
arch/powerpc/kernel/vdso/Makefile | 4 +-
arch/riscv/include/uapi/asm/elf.h | 66 ----
arch/riscv/kernel/vdso/Makefile | 11 +-
arch/s390/include/asm/elf.h | 83 -----
arch/s390/kernel/vdso32/Makefile | 4 +-
arch/s390/kernel/vdso64/Makefile | 4 +-
arch/x86/entry/vdso/Makefile | 6 +-
arch/x86/include/asm/elf.h | 34 --
arch/x86/um/asm/elf.h | 33 --
include/uapi/linux/elf-r.h | 631 ++++++++++++++++++++++++++++++++++++
include/uapi/linux/elf.h | 1 +
lib/vdso/Makefile | 2 +
lib/vdso/Makefile.include | 17 +
lib/vdso/check/.gitignore | 3 +
lib/vdso/check/Makefile | 28 ++
lib/vdso/check/elf.rs | 488 ++++++++++++++++++++++++++++
lib/vdso/check/vdsocheck.rs | 279 ++++++++++++++++
tools/include/uapi/linux/elf-em.h | 71 ++++
tools/include/uapi/linux/elf-r.h | 631 ++++++++++++++++++++++++++++++++++++
tools/include/uapi/linux/elf.h | 112 ++++++-
29 files changed, 2277 insertions(+), 684 deletions(-)
---
base-commit: 5180c6526acc9f1cb58f8b11fba67583c22e0854
change-id: 20250428-vdso-absolute-reloc-a226293c1761
Best regards,
--
Thomas Weißschuh <thomas.weissschuh@...utronix.de>
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