From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 96DD8C79F99 for ; Tue, 8 Sep 2026 07:19:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=cvxxmFP38glDv9aUVdeEkTg6ek/m9m390THhoWCfEM0=; b=EE4u3yGc3YW2FQzUmMDBKIRST6 h/57RuDFYuFyP6uLmHGBmhG3HXMDlS4wLzsXJkmyZfsh39cxj6jeclBsoqbvulY/mToplH+Rk/+2y Ly6+PjH4pZ4qNzSV6Rt2LT/RBDuAAZfNd2aAkmivZo9ajRQP+it7jdK9MImuiNQwjze6pijw8+HCj kKB2U3W69bxnGxj1at0DH3RCZMGSkjzzJbEwbITXt/hYDZWbkBMSNyBKumLH/co9UYoLxqsGE7XxB dy4/u/pa7l98IsvoYRRFULsIRr4u5HtLapTMA1t0mVWlJblm1V05HRxPKEJaDIqIiaRdKVWgpnE47 zHbKrJKw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x3q6y-00000008GEH-0ela; Tue, 08 Sep 2026 07:19:20 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x3q6w-00000008GDI-30fc; Tue, 08 Sep 2026 07:19:18 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Transfer-Encoding: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=cvxxmFP38glDv9aUVdeEkTg6ek/m9m390THhoWCfEM0=; b=UoZziDS/M2tkE9i/kd/fRWxjxG xi+fyu0pTnULNJBoBTxWqssjFBpND46iwdm8/Xdasvn1rRlVO3YRTifGQHqQ7Djyr0qN+giJZ+fhm VGFo7VQcUzTluQnwuFY/TINjSZwGg2wAu6h/I2aJQekwAQAHDfDRbs5c4653HmcsHzR3/MT7uYBiv OHGOF2sDyRO8Ng0HJl/EAucBF+nX0HMCIeEV9AzqfniAsQubp91a/6o38RnF6m5eUvGRXcnh6SFwM YSzWSLDv1463xBJzjZwzhVMGY0l1ix+hGiimn09WhCg0UeYSjjmBlFhgA8gLyLSTRRkm2555WQmqU gUx+TBrQ==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.99.2 #2 (Red Hat Linux)) id 1x3q6s-0000000H2YA-0CKd; Tue, 08 Sep 2026 07:19:14 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 5B0713005AF; Tue, 08 Sep 2026 09:19:11 +0200 (CEST) Date: Tue, 8 Sep 2026 09:19:11 +0200 From: Peter Zijlstra To: Thomas =?iso-8859-1?Q?Wei=DFschuh?= Cc: Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Andy Lutomirski , Vincenzo Frascino , Kees Cook , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. 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> 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> X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org 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?