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[58.96.106.158]) by smtp.gmail.com with ESMTPSA id h4sm22508539pgp.8.2020.12.14.15.18.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Dec 2020 15:18:32 -0800 (PST) Received: by bubble.grove.modra.org (Postfix, from userid 1000) id D755681792; Tue, 15 Dec 2020 09:48:27 +1030 (ACDT) Date: Tue, 15 Dec 2020 09:48:27 +1030 From: Alan Modra To: Nick Desaulniers Subject: Re: [PATCH] arm64: link with -z norelro regardless of CONFIG_RELOCATABLE Message-ID: <20201214231827.GG8873@bubble.grove.modra.org> References: <20201016175339.2429280-1-ndesaulniers@google.com> <160319373854.2175971.17968938488121846972.b4-ty@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201214_181837_228945_B8E1F3EE X-CRM114-Status: GOOD ( 12.47 ) 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: =?utf-8?B?RsSBbmctcnXDrCBTw7JuZw==?= , Will Deacon , Quentin Perret , Catalin Marinas , LKML , "# 3.4.x" , Peter Smith , clang-built-linux , kernel-team , 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 Mon, Dec 14, 2020 at 01:44:06PM -0800, Nick Desaulniers wrote: > aarch64-linux-gnu-ld: warning: -z norelro ignored > > So we set the emulation mode via -maarch64elf, and our preprocessed The default linker emulation for an aarch64-linux ld.bfd is -maarch64linux, the default for an aarch64-elf linker is -maarch64elf. They are not equivalent. If you choose -maarch64elf you get an emulation that doesn't support -z relro. Now I don't know why the kernel uses -maarch64elf so you shouldn't interpret my comment as a recommendation to use -maarch64linux instead. That may have other unwanted effects. -- Alan Modra Australia Development Lab, IBM _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel