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Peter Anvin" , Richard Weinberger , Anton Ivanov , Johannes Berg , Russell King , Catalin Marinas , Will Deacon , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Huacai Chen , WANG Xuerui , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Thomas Bogendoerfer , Miguel Ojeda , Alex Gaynor , Gary Guo , =?iso-8859-1?Q?Bj=F6rn?= Roy Baron , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Thomas Gleixner , Christophe Leroy , Boqun Feng , Nicolas Schier , 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 , Arnaldo Carvalho de Melo , Alexandre Ghiti Subject: Re: [PATCH v5 12/24] vdso: Add the vdsocheck tool Message-ID: <20260908071911.GU4120091@noisy.programming.kicks-ass.net> References: <20260908-vdso-absolute-reloc-v5-0-3a93791af1cf@linutronix.de> <20260908-vdso-absolute-reloc-v5-12-3a93791af1cf@linutronix.de> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260908-vdso-absolute-reloc-v5-12-3a93791af1cf@linutronix.de> On Tue, Sep 08, 2026 at 08:33:46AM +0200, Thomas Weißschuh wrote: > All vDSO code needs to be completely position independent. Symbol > references are marked as hidden so the compiler emits PC-relative > relocations. However there are cases where the compiler may still > emit absolute relocations, as they are valid in regular PIC DSO code. > These would be resolved by the linker and will break at runtime. > This has been observed on arm64, see commit 0c314cda9325 ("arm64: vdso: > Work around invalid absolute relocations from GCC") > > Introduce a tool to check for absolute relocations during the build, > as the current inline-shell logic is not expressive enough. > The check is done on the object files as the relocations will not exist > anymore in the final DSO. As there is no extension point for the > compilation of each object file, perform the validation in vdso_check. > > Signed-off-by: Thomas Weißschuh > --- > Makefile | 19 ++ > lib/vdso/Kconfig | 5 + > lib/vdso/Makefile | 2 + > lib/vdso/Makefile.include | 14 ++ > lib/vdso/check/.gitignore | 3 + > lib/vdso/check/Makefile | 34 +++ > lib/vdso/check/elf.rs | 498 ++++++++++++++++++++++++++++++++++++++++++++ > lib/vdso/check/vdsocheck.rs | 154 ++++++++++++++ > 8 files changed, 729 insertions(+) Urgh, does this mean I have to have rust installed just to build a kernel now?