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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:33188) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jpyBO-00086P-1w; Mon, 29 Jun 2020 19:07:06 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1jpyBM-0007KD-3O; Mon, 29 Jun 2020 19:07:04 +0100 Date: Mon, 29 Jun 2020 19:07:04 +0100 From: Russell King - ARM Linux admin To: Arvind Sankar Subject: Re: [PATCH v4 14/17] arm/build: Warn on orphan section placement Message-ID: <20200629180703.GX1551@shell.armlinux.org.uk> References: <20200629061840.4065483-1-keescook@chromium.org> <20200629061840.4065483-15-keescook@chromium.org> <20200629155401.GB900899@rani.riverdale.lan> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200629155401.GB900899@rani.riverdale.lan> User-Agent: Mutt/1.10.1 (2018-07-13) 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: Mark Rutland , linux-arch@vger.kernel.org, linux-efi@vger.kernel.org, Kees Cook , Arnd Bergmann , Peter Collingbourne , Catalin Marinas , Masahiro Yamada , x86@kernel.org, Nick Desaulniers , linux-kernel@vger.kernel.org, Nathan Chancellor , clang-built-linux@googlegroups.com, Ingo Molnar , James Morse , Thomas Gleixner , Borislav Petkov , Will Deacon , Ard Biesheuvel , linux-arm-kernel@lists.infradead.org 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, Jun 29, 2020 at 11:54:01AM -0400, Arvind Sankar wrote: > On Sun, Jun 28, 2020 at 11:18:37PM -0700, Kees Cook wrote: > > We don't want to depend on the linker's orphan section placement > > heuristics as these can vary between linkers, and may change between > > versions. All sections need to be explicitly named in the linker > > script. > > > > Specifically, this would have made a recently fixed bug very obvious: > > > > ld: warning: orphan section `.fixup' from `arch/arm/lib/copy_from_user.o' being placed in section `.fixup' > > > > Discard unneeded sections .iplt, .rel.iplt, .igot.plt, and .modinfo. > > > > Add missing text stub sections .vfp11_veneer and .v4_bx. > > > > Add debug sections explicitly. > > > > Finally enable orphan section warning. > > This is unrelated to this patch as such, but I noticed that ARM32/64 places > the .got section inside .text -- is that expected on ARM? Do you mean in general, in the kernel vmlinux, in the decompressor vmlinux or ... ? -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel