From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753129AbdBCJyc (ORCPT ); Fri, 3 Feb 2017 04:54:32 -0500 Received: from mail-wm0-f44.google.com ([74.125.82.44]:37278 "EHLO mail-wm0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753112AbdBCJy3 (ORCPT ); Fri, 3 Feb 2017 04:54:29 -0500 From: Ard Biesheuvel To: linux-kbuild@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, jeyu@redhat.com, rusty@rustcorp.com.au, mmarek@suse.com, mpe@ellerman.id.au Cc: torvalds@linux-foundation.org, arnd@arndb.de, viro@zeniv.linux.org.uk, linux-arm-kernel@lists.infradead.org, Ard Biesheuvel Subject: [PATCH v5 0/3] modversions: redefine kcrctab entries as 32-bit values Date: Fri, 3 Feb 2017 09:54:04 +0000 Message-Id: <1486115647-27680-1-git-send-email-ard.biesheuvel@linaro.org> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This v4 is a followup to [0] 'modversions: redefine kcrctab entries as relative CRC pointers', but since relative CRC pointers do not work in modules, and are actually only needed by powerpc with CONFIG_RELOCATABLE=y, I have made it a Kconfig selectable feature instead. Patch #1 introduces the MODULE_REL_CRCS Kconfig symbol, and adds the kbuild handling of it, i.e., modpost, genksyms and kallsyms. Patch #2 switches all architectures to 32-bit CRC entries in kcrctab, where all architectures except powerpc with CONFIG_RELOCATABLE=y use absolute ELF symbol references as before. v5: make MODULE_REL_CRCS apply to both vmlinux and modules when selected reinstate Rusty's ack on #2, given that it is now mostly identical again to the patch he acked 3 months ago v4: make relative CRCs kconfig selectable use absolute CRC symbols in modules regardless of kconfig selection split into two patches v3: emit CRCs into .rodata rather than .rodata.modver, given that the latter will be emitted with read-write permissions, making the CRCs end up in a writable module segment. fold the modpost fix to ensure that the section address is only substracted from the symbol address when the ELF object in question is fully linked (i.e., ET_DYN or ET_EXEC, and not ET_REL) v2: update modpost as well, so that genksyms no longer has to emit symbols for both the actual CRC value and the reference to where it is stored in the image [0] http://marc.info/?l=linux-arch&m=148493613415294&w=2 Ard Biesheuvel (3): kbuild: modversions: add infrastructure for emitting relative CRCs modversions: treat symbol CRCs as 32 bit quantities module: unify absolute krctab definitions for 32-bit and 64-bit arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/module.h | 4 -- arch/powerpc/kernel/module_64.c | 8 --- include/asm-generic/export.h | 11 ++-- include/linux/export.h | 17 +++++-- include/linux/module.h | 14 +++--- init/Kconfig | 4 ++ kernel/module.c | 53 +++++++++----------- scripts/Makefile.build | 2 + scripts/genksyms/genksyms.c | 19 +++++-- scripts/kallsyms.c | 12 +++++ scripts/mod/modpost.c | 10 ++++ 12 files changed, 93 insertions(+), 62 deletions(-) -- 2.7.4