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Wed, 11 Nov 2020 18:52:16 -0800 (PST) Date: Wed, 11 Nov 2020 19:52:14 -0700 From: Nathan Chancellor To: Nick Desaulniers Subject: Re: [PATCH] ARM: Link with '-z norelro' Message-ID: <20201112025214.GA873083@ubuntu-m3-large-x86> References: <20201110015632.2509254-1-natechancellor@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201111_215221_891869_5FB81087 X-CRM114-Status: GOOD ( 21.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Florian Fainelli , Arnd Bergmann , Abbott Liu , Linus Walleij , Russell King , Jian Cai , clang-built-linux , Andrey Ryabinin , Mike Rapoport , Will Deacon , Ard Biesheuvel , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Nov 10, 2020 at 10:49:32AM -0800, Nick Desaulniers wrote: > On Mon, Nov 9, 2020 at 6:05 PM Nick Desaulniers wrote: > > > > On Mon, Nov 9, 2020 at 5:56 PM Nathan Chancellor > > wrote: > > > > > > When linking a multi_v7_defconfig + CONFIG_KASAN=y kernel with > > > LD=ld.lld, the following error occurs: > > > > > > $ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- LLVM=1 zImage > > > ld.lld: error: section: .exit.data is not contiguous with other relro sections > > > > > > LLD defaults to '-z relro', which is unneeded for the kernel because > > > program headers are not used nor is there any position independent code > > > generation or linking for ARM. Add '-z norelro' to LDFLAGS_vmlinux to > > > avoid this error. > > > > > > Link: https://github.com/ClangBuiltLinux/linux/issues/1189 > > > Signed-off-by: Nathan Chancellor > > > > Reviewed-by: Nick Desaulniers > > Tested-by: Nick Desaulniers > > > > Thanks for the patch! > > See also: https://lore.kernel.org/linux-arm-kernel/20201016175339.2429280-1-ndesaulniers@google.com/ > > where we just did the same thing for aarch64. > > I was thinking more about this last night. If we're going to be > playing whack-a-mole for each architecture with this, would it be > worthwhile for us to raise this up to the top level Makefile? Sure, I can send a patch along tomorrow that adds '-z norelro' to LDFLAGS_vmlinux in the top level Makefile. Cheers, Nathan _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel