From patchwork Tue Aug 30 19:37:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fangrui Song X-Patchwork-Id: 12959787 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2DB4EECAAA1 for ; Tue, 30 Aug 2022 19:37:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229893AbiH3ThJ (ORCPT ); Tue, 30 Aug 2022 15:37:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57312 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230041AbiH3ThI (ORCPT ); Tue, 30 Aug 2022 15:37:08 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5DD1761D94 for ; Tue, 30 Aug 2022 12:37:06 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id f12-20020a25b6cc000000b0069a9e36de26so492289ybm.16 for ; Tue, 30 Aug 2022 12:37:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc; bh=HzbcF/PG+Qawg6hoRF5n8gXT8jVmH+0bSMmdlpBSH5Q=; b=WpitjJHu8yxIzlhTDzfzTCcSOyFFbGrF9N7RrYOmSR07TVUgSws08DXXqfslj/EH5j IsYZqhJ5K8tAhqVApAq2q/WIC/++F5MDzikJlI38OBsGNSnjrVnezaJyqELJ24AWj9oY +7zvlA29KkLUGk9Uj43LWRMl4eQscf8yt8u3sVQKPxrcuFB3XdTu33eTM9AW7mrkzjHJ MWB68cpxlcvUtd5L6VGzqO0qLNv4Hgt9Va3PWgaVR9ZPp1c62DtJKo0xM30WTUSA53v6 pG4vF6AJRUnrXSYmplq5oKz4I9od/3GkzCLSCofbWUy+mWFkhhKIj3T9xk09kAq1idXu 8d5w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc; bh=HzbcF/PG+Qawg6hoRF5n8gXT8jVmH+0bSMmdlpBSH5Q=; b=XAI4itddtGMc/MOuNeljpYE0XXBjtt23z+OqF8pZNfoTQPiEdkJJ0p8wC6ga8/ThMd lLNJ++OQi13zPiqoWe+kO0oUJNR5CZemhQSGcl5fzw92lR/rhRZ6TRnQtlC7ajsoHLIV 6++lBihuqn4vIaJ1AA6r+ksypDXcHP+aT337Hr6Qm1WF5TBV4UfzqMscdasiVz5tUWjs VMdf6seKxNBvdXt/lI5Rq2+WgNOz8v1yH9hT+abnbixu+SCqaVlcBEVf3AbG5nUnqBNm lC52C68Ap16VLr0+fNCFyNgp9foXwxNeOIMiXwB3iUsczh59KWFtRP4ND6/Cg1+vKw0E RnCQ== X-Gm-Message-State: ACgBeo2dIeP7GpFQBs/SdtTfLOK4W1z3BHgFlvuPkO186/qCUaz7Xb0a jCMM+6hnnvzu2142kQvlEHq2IN4R8xa5 X-Google-Smtp-Source: AA6agR7bVRyO8OFgpLGeXzgagUQGCk3zR5h8YG1Nini2V46NdLsYk5dAFhH/q7QqcX6WfjSFE1K09uH566NU X-Received: from maskray1.svl.corp.google.com ([2620:15c:2ce:200:2c5:644c:c610:2bb9]) (user=maskray job=sendgmr) by 2002:a0d:eb4f:0:b0:341:8004:8ebd with SMTP id u76-20020a0deb4f000000b0034180048ebdmr3573747ywe.396.1661888225675; Tue, 30 Aug 2022 12:37:05 -0700 (PDT) Date: Tue, 30 Aug 2022 12:37:01 -0700 Mime-Version: 1.0 Message-ID: <20220830193701.1702962-1-maskray@google.com> Subject: [PATCH] vdso: Improve cmd_vdso_check to check all dynamic relocations From: Fangrui Song To: Vincenzo Frascino , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org Cc: Fangrui Song Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org The actual intention is that no dynamic relocation exists. However, some GNU ld ports produce unneeded R_*_NONE. (If a port is not care enough to determine the exact .rel[a].dyn size, the trailing zeros become R_*_NONE relocations. E.g. powerpc64le ld as of 2.38 has the issue with defconfig.) R_*_NONE are generally no-op in the dynamic loaders. So just ignore them. With the change, we can remove ARCH_REL_TYPE_ABS. ARCH_REL_TYPE_ABS is a bit misnomer as ports may check RELAVETIVE/GLOB_DAT/JUMP_SLOT which are not called "absolute relocations". (The patch is motivated by the arm64 port missing R_AARCH64_RELATIVE.) While here, replace "egrep" with "grep" as "egrep" is deprecated in GNU grep 3.7. Signed-off-by: Fangrui Song Reviewed-by: Christophe Leroy --- arch/arm/vdso/Makefile | 3 --- arch/arm64/kernel/vdso/Makefile | 3 --- arch/arm64/kernel/vdso32/Makefile | 3 --- arch/csky/kernel/vdso/Makefile | 3 --- arch/loongarch/vdso/Makefile | 3 --- arch/mips/vdso/Makefile | 3 --- arch/powerpc/kernel/vdso/Makefile | 1 - arch/riscv/kernel/vdso/Makefile | 3 --- arch/s390/kernel/vdso32/Makefile | 2 -- arch/s390/kernel/vdso64/Makefile | 2 -- arch/x86/entry/vdso/Makefile | 4 ---- lib/vdso/Makefile | 13 ++++--------- 12 files changed, 4 insertions(+), 39 deletions(-) diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile index 8ca1c9f262a2..5ebd2e6f7d46 100644 --- a/arch/arm/vdso/Makefile +++ b/arch/arm/vdso/Makefile @@ -1,8 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 -# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before -# the inclusion of generic Makefile. -ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32 include $(srctree)/lib/vdso/Makefile hostprogs := vdsomunge diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile index bafbf78fab77..66dc4f338a86 100644 --- a/arch/arm64/kernel/vdso/Makefile +++ b/arch/arm64/kernel/vdso/Makefile @@ -6,9 +6,6 @@ # Heavily based on the vDSO Makefiles for other archs. # -# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before -# the inclusion of generic Makefile. -ARCH_REL_TYPE_ABS := R_AARCH64_JUMP_SLOT|R_AARCH64_GLOB_DAT|R_AARCH64_ABS64 include $(srctree)/lib/vdso/Makefile obj-vdso := vgettimeofday.o note.o sigreturn.o diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile index 36c8f66cad25..48d713d59ef2 100644 --- a/arch/arm64/kernel/vdso32/Makefile +++ b/arch/arm64/kernel/vdso32/Makefile @@ -3,9 +3,6 @@ # Makefile for vdso32 # -# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before -# the inclusion of generic Makefile. -ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32 include $(srctree)/lib/vdso/Makefile # Same as cc-*option, but using CC_COMPAT instead of CC diff --git a/arch/csky/kernel/vdso/Makefile b/arch/csky/kernel/vdso/Makefile index 0b6909f10667..86c8c4de1b0f 100644 --- a/arch/csky/kernel/vdso/Makefile +++ b/arch/csky/kernel/vdso/Makefile @@ -1,8 +1,5 @@ # SPDX-License-Identifier: GPL-2.0-only -# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before -# the inclusion of generic Makefile. -ARCH_REL_TYPE_ABS := R_CKCORE_ADDR32|R_CKCORE_JUMP_SLOT include $(srctree)/lib/vdso/Makefile # Symbols present in the vdso diff --git a/arch/loongarch/vdso/Makefile b/arch/loongarch/vdso/Makefile index d89e2ac75f7b..1b2e0f149f55 100644 --- a/arch/loongarch/vdso/Makefile +++ b/arch/loongarch/vdso/Makefile @@ -1,9 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 # Objects to go into the VDSO. -# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before -# the inclusion of generic Makefile. -ARCH_REL_TYPE_ABS := R_LARCH_32|R_LARCH_64|R_LARCH_MARK_LA|R_LARCH_JUMP_SLOT include $(srctree)/lib/vdso/Makefile obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o sigreturn.o diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile index f72658b3a53f..cea97abffc03 100644 --- a/arch/mips/vdso/Makefile +++ b/arch/mips/vdso/Makefile @@ -4,9 +4,6 @@ # Sanitizer runtimes are unavailable and cannot be linked here. KCSAN_SANITIZE := n -# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before -# the inclusion of generic Makefile. -ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT include $(srctree)/lib/vdso/Makefile obj-vdso-y := elf.o vgettimeofday.o sigreturn.o diff --git a/arch/powerpc/kernel/vdso/Makefile b/arch/powerpc/kernel/vdso/Makefile index 096b0bf1335f..d3c5be32034d 100644 --- a/arch/powerpc/kernel/vdso/Makefile +++ b/arch/powerpc/kernel/vdso/Makefile @@ -2,7 +2,6 @@ # List of files in the vdso, has to be asm only for now -ARCH_REL_TYPE_ABS := R_PPC_JUMP_SLOT|R_PPC_GLOB_DAT|R_PPC_ADDR32|R_PPC_ADDR24|R_PPC_ADDR16|R_PPC_ADDR16_LO|R_PPC_ADDR16_HI|R_PPC_ADDR16_HA|R_PPC_ADDR14|R_PPC_ADDR14_BRTAKEN|R_PPC_ADDR14_BRNTAKEN|R_PPC_REL24 include $(srctree)/lib/vdso/Makefile obj-vdso32 = sigtramp32-32.o gettimeofday-32.o datapage-32.o cacheflush-32.o note-32.o getcpu-32.o diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile index f2e065671e4d..77d6bed3a700 100644 --- a/arch/riscv/kernel/vdso/Makefile +++ b/arch/riscv/kernel/vdso/Makefile @@ -1,9 +1,6 @@ # SPDX-License-Identifier: GPL-2.0-only # Copied from arch/tile/kernel/vdso/Makefile -# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before -# the inclusion of generic Makefile. -ARCH_REL_TYPE_ABS := R_RISCV_32|R_RISCV_64|R_RISCV_JUMP_SLOT include $(srctree)/lib/vdso/Makefile # Symbols present in the vdso vdso-syms = rt_sigreturn diff --git a/arch/s390/kernel/vdso32/Makefile b/arch/s390/kernel/vdso32/Makefile index 245bddfe9bc0..e795fdbbf484 100644 --- a/arch/s390/kernel/vdso32/Makefile +++ b/arch/s390/kernel/vdso32/Makefile @@ -2,8 +2,6 @@ # List of files in the vdso KCOV_INSTRUMENT := n -ARCH_REL_TYPE_ABS := R_390_COPY|R_390_GLOB_DAT|R_390_JMP_SLOT|R_390_RELATIVE -ARCH_REL_TYPE_ABS += R_390_GOT|R_390_PLT include $(srctree)/lib/vdso/Makefile obj-vdso32 = vdso_user_wrapper-32.o note-32.o diff --git a/arch/s390/kernel/vdso64/Makefile b/arch/s390/kernel/vdso64/Makefile index 9e2b95a222a9..47dbbfdfad68 100644 --- a/arch/s390/kernel/vdso64/Makefile +++ b/arch/s390/kernel/vdso64/Makefile @@ -2,8 +2,6 @@ # List of files in the vdso KCOV_INSTRUMENT := n -ARCH_REL_TYPE_ABS := R_390_COPY|R_390_GLOB_DAT|R_390_JMP_SLOT|R_390_RELATIVE -ARCH_REL_TYPE_ABS += R_390_GOT|R_390_PLT include $(srctree)/lib/vdso/Makefile obj-vdso64 = vdso_user_wrapper.o note.o diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile index 12f6c4d714cd..a97f3630ca20 100644 --- a/arch/x86/entry/vdso/Makefile +++ b/arch/x86/entry/vdso/Makefile @@ -3,10 +3,6 @@ # Building vDSO images for x86. # -# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before -# the inclusion of generic Makefile. -ARCH_REL_TYPE_ABS := R_X86_64_JUMP_SLOT|R_X86_64_GLOB_DAT|R_X86_64_RELATIVE| -ARCH_REL_TYPE_ABS += R_386_GLOB_DAT|R_386_JMP_SLOT|R_386_RELATIVE include $(srctree)/lib/vdso/Makefile # Sanitizer runtimes are unavailable and cannot be linked here. diff --git a/lib/vdso/Makefile b/lib/vdso/Makefile index c415a685d61b..9f031eafc465 100644 --- a/lib/vdso/Makefile +++ b/lib/vdso/Makefile @@ -5,18 +5,13 @@ GENERIC_VDSO_DIR := $(dir $(GENERIC_VDSO_MK_PATH)) c-gettimeofday-$(CONFIG_GENERIC_GETTIMEOFDAY) := $(addprefix $(GENERIC_VDSO_DIR), gettimeofday.c) -# This cmd checks that the vdso library does not contain absolute relocation +# This cmd checks that the vdso library does not contain dynamic relocations. # It has to be called after the linking of the vdso library and requires it # as a parameter. # -# $(ARCH_REL_TYPE_ABS) is defined in the arch specific makefile and corresponds -# to the absolute relocation types printed by "objdump -R" and accepted by the -# dynamic linker. -ifndef ARCH_REL_TYPE_ABS -$(error ARCH_REL_TYPE_ABS is not set) -endif - +# As a workaround for some GNU ld ports which produce unneeded R_*_NONE +# dynamic relocations, ignore R_*_NONE. quiet_cmd_vdso_check = VDSOCHK $@ - cmd_vdso_check = if $(OBJDUMP) -R $@ | egrep -h "$(ARCH_REL_TYPE_ABS)"; \ + cmd_vdso_check = if $(READELF) -rW $@ | grep -v _NONE | grep -q " R_\w*_"; \ then (echo >&2 "$@: dynamic relocations are not supported"; \ rm -f $@; /bin/false); fi