From: "Thomas Weißschuh" <thomas.weissschuh@linutronix.de>
To: "Paul Walmsley" <paul.walmsley@sifive.com>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Albert Ou" <aou@eecs.berkeley.edu>,
"Alexandre Ghiti" <alex@ghiti.fr>,
"Nathan Chancellor" <nathan@kernel.org>,
"Nick Desaulniers" <nick.desaulniers+lkml@gmail.com>,
"Bill Wendling" <morbo@google.com>,
"Justin Stitt" <justinstitt@google.com>,
"Andy Lutomirski" <luto@kernel.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Vincenzo Frascino" <vincenzo.frascino@arm.com>,
"Kees Cook" <kees@kernel.org>, "Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
"Richard Weinberger" <richard@nod.at>,
"Anton Ivanov" <anton.ivanov@cambridgegreys.com>,
"Johannes Berg" <johannes@sipsolutions.net>,
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"Will Deacon" <will@kernel.org>,
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"Christophe Leroy" <christophe.leroy@csgroup.eu>,
"Huacai Chen" <chenhuacai@kernel.org>,
"WANG Xuerui" <kernel@xen0n.name>,
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"Vasily Gorbik" <gor@linux.ibm.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
"Sven Schnelle" <svens@linux.ibm.com>,
"Thomas Bogendoerfer" <tsbogend@alpha.franken.de>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Alice Ryhl" <aliceryhl@google.com>,
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"Nicolas Schier" <nicolas.schier@linux.dev>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
llvm@lists.linux.dev, linux-mm@kvack.org,
linux-um@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev,
linux-s390@vger.kernel.org, linux-mips@vger.kernel.org,
rust-for-linux@vger.kernel.org, linux-kbuild@vger.kernel.org,
"Jan Stancek" <jstancek@redhat.com>,
"Arnaldo Carvalho de Melo" <acme@redhat.com>,
"Alexandre Ghiti" <alexghiti@rivosinc.com>,
"Thomas Weißschuh" <thomas.weissschuh@linutronix.de>
Subject: [PATCH v4 00/24] vdso: Reject absolute relocations during build
Date: Tue, 12 Aug 2025 07:44:13 +0200 [thread overview]
Message-ID: <20250812-vdso-absolute-reloc-v4-0-61a8b615e5ec@linutronix.de> (raw)
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@linutronix.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@linutronix.de>
next reply other threads:[~2025-08-12 5:44 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-12 5:44 Thomas Weißschuh [this message]
2025-08-12 5:44 ` [PATCH v4 01/24] elf, uapi: Add a header for relocation constants Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 02/24] x86/elf, um/x86/elf: Move relocation constants to UAPI Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 03/24] ARM: elf: " Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 04/24] arm64: " Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 05/24] powerpc/elf: " Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 06/24] riscv: elf: " Thomas Weißschuh
2025-08-15 15:05 ` Palmer Dabbelt
2025-08-12 5:44 ` [PATCH v4 07/24] LoongArch: " Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 08/24] s390/elf: " Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 09/24] MIPS: ELF: " Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 10/24] tools headers UAPI: Sync ELF headers with the kernel sources Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 11/24] vdso: Add the vdsocheck tool Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 12/24] x86/vdso: Enable " Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 13/24] ARM: vdso: " Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 14/24] arm64: " Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 15/24] powerpc/elf: Add 32-bit REL16 relocation definitions Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 16/24] powerpc/vdso: Enable the vdsocheck tool Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 17/24] riscv: vdso: Deduplicate CFLAGS_REMOVE_* variables Thomas Weißschuh
2025-08-15 15:07 ` Palmer Dabbelt
2025-08-12 5:44 ` [PATCH v4 18/24] riscv: vdso: Disable LTO for the vDSO Thomas Weißschuh
2025-08-15 15:07 ` Palmer Dabbelt
2025-08-12 5:44 ` [PATCH v4 19/24] riscv: vdso: Enable the vdsocheck tool Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 20/24] LoongArch: vDSO: " Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 21/24] s390/vdso: " Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 22/24] MIPS: ELF: Add more PC-relative relocation definitions Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 23/24] MIPS: vdso: Enable the vdsocheck tool Thomas Weißschuh
2025-08-12 5:44 ` [PATCH v4 24/24] vdso/vdsocheck: Drop the transitional kconfig option Thomas Weißschuh
2025-08-12 11:07 ` [PATCH v4 00/24] vdso: Reject absolute relocations during build Miguel Ojeda
2025-08-13 8:16 ` Thomas Weißschuh
2025-08-14 13:43 ` Christophe Leroy
2025-08-15 10:06 ` Thomas Weißschuh
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