From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8ECDEC6FD19 for ; Fri, 10 Mar 2023 19:08:58 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4PYFvr5VdGz3f8R for ; Sat, 11 Mar 2023 06:08:56 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20210112 header.b=LxEH6iUV; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=flex--maskray.bounces.google.com (client-ip=2607:f8b0:4864:20::b49; helo=mail-yb1-xb49.google.com; envelope-from=3dyalzackdgimaskraygoogle.comlinuxppc-devlists.ozlabs.org@flex--maskray.bounces.google.com; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20210112 header.b=LxEH6iUV; dkim-atps=neutral Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4PYFtq4Qp8z3f3n for ; Sat, 11 Mar 2023 06:08:01 +1100 (AEDT) Received: by mail-yb1-xb49.google.com with SMTP id e195-20020a25e7cc000000b00a1e59ba7ed9so6663763ybh.11 for ; Fri, 10 Mar 2023 11:08:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1678475277; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=fK32HCA5CEK3I1OSPAFiJP4orExE4ivImV9o1+O5Pgs=; b=LxEH6iUVJ8Ud+MSbSJ1bywctAFUXlXrIod3JRCgJ46Edv9Oe8Ve20gFj4XvBZFYnaB astsvOG4c/RdJci0z23qVYsPo5sK5r1Xbc5EpRQrU1h2CBYEzaZqbIM4nhiJ+FCJxCx0 JXXXxUF+h6Ee4DH4hL4EsBDfF5Cq45cpT8+RNjYPO0b5/xehUckR0i1XTqMrXdre+eVz hNmc3VuXk6I7mlBynowuwBRs4qmhqBylCP7/WQ+cwA8FgTlEbAm611HSd++833GdExnZ SoEAimePtX0mL9JUWGWtYz0tGNbLBJYVr2N17rNhBrZZbcAY0u0HShnIOkAy/aJS+wvK FmMQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678475277; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=fK32HCA5CEK3I1OSPAFiJP4orExE4ivImV9o1+O5Pgs=; b=1IZmnB/2Uyjz5gO8R2KilsgHCrNvx5S8yvpTlT5L/bwtu8Ylx/rFDOgRiKtxSn7S+y Bkhy6gJydPeBHZfNayR8mjgnxBnxK8D1ZoAnQu+gEipDMJsxWLCMkegBO+5tFJvjvhEl JDyx58b3/SSMi2LUtBR37XwEAYYc6Wggai6yhj8wkhMAcBYSX3qpoQzbe5y6OWIWXyxt HR0qhtzXsT/wnnYeVSsdBS2vVQq+5rHNjKddR6S1J1OUQkvBE88MMHTy3PLOuLRMYeHE v3FSujZvV72EhQM9fxhtOcZcjtLuCrYr06/jn8iWdyKqAmDznUendgjBy6B1EfVedeJU J4Eg== X-Gm-Message-State: AO0yUKXQfBeSoQgAhFo0X2jhg/4NLx6HjZFr0Ji+bC1YI342B4inIwfg onEMavTh/s9MT8lUPbjnz71+kmx4V6q4 X-Google-Smtp-Source: AK7set+EM8BzLBCwhTK0DWxwYdJHC/bm5m06bpWqpMb4VNF5gVdI36SpJH1I+JB+DIYaAC09X62RCqRdJSoJ X-Received: from meowing-l.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:3eba]) (user=maskray job=sendgmr) by 2002:a05:6902:145:b0:ac2:a7a7:23c3 with SMTP id p5-20020a056902014500b00ac2a7a723c3mr11393476ybh.12.1678475277206; Fri, 10 Mar 2023 11:07:57 -0800 (PST) Date: Fri, 10 Mar 2023 19:07:50 +0000 Mime-Version: 1.0 Message-ID: <20230310190750.3323802-1-maskray@google.com> Subject: [PATCH v3] vdso: Improve cmd_vdso_check to check all dynamic relocations From: Fangrui Song To: Vincenzo Frascino , Christophe Leroy , Andy Lutomirski , Thomas Gleixner , Arnd Bergmann Content-Type: text/plain; charset="UTF-8" X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-s390@vger.kernel.org, Fangrui Song , linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-mips@vger.kernel.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" The actual intention is that no dynamic relocation exists. However, some GNU ld ports produce unneeded R_*_NONE. (If a port fails to determine the exact .rel[a].dyn size, the trailing zeros become R_*_NONE relocations. E.g. ld's powerpc port recently fixed https://sourceware.org/bugzilla/show_bug.cgi?id=29540) 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.) Signed-off-by: Fangrui Song Reviewed-by: Christophe Leroy Reviewed-by: Vincenzo Frascino # for vDSO, aarch64 Tested-by: Vincenzo Frascino # for aarch64 --- Changes from v2: * rebase Changes from v3: * Add a comment before `include $(srctree)/lib/vdso/Makefile` in every touched arch Makefile --- arch/arm/vdso/Makefile | 4 +--- arch/arm64/kernel/vdso/Makefile | 4 +--- arch/arm64/kernel/vdso32/Makefile | 3 --- arch/csky/kernel/vdso/Makefile | 4 +--- arch/loongarch/vdso/Makefile | 4 +--- arch/mips/vdso/Makefile | 4 +--- arch/powerpc/kernel/vdso/Makefile | 2 +- arch/riscv/kernel/vdso/Makefile | 4 +--- arch/s390/kernel/vdso32/Makefile | 3 +-- arch/s390/kernel/vdso64/Makefile | 3 +-- arch/x86/entry/vdso/Makefile | 5 +---- lib/vdso/Makefile | 13 ++++--------- 12 files changed, 14 insertions(+), 39 deletions(-) diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile index a7ec06ce3785..515ca33b854c 100644 --- a/arch/arm/vdso/Makefile +++ b/arch/arm/vdso/Makefile @@ -1,8 +1,6 @@ # 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 the generic Makefile to check the built vdso. include $(srctree)/lib/vdso/Makefile hostprogs := vdsomunge diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile index beaf9586338f..fe7a53c6781f 100644 --- a/arch/arm64/kernel/vdso/Makefile +++ b/arch/arm64/kernel/vdso/Makefile @@ -6,9 +6,7 @@ # 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 the generic Makefile to check the built vdso. 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 f59bd1a4ead6..d014162c5c71 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..299e4e41ebc5 100644 --- a/arch/csky/kernel/vdso/Makefile +++ b/arch/csky/kernel/vdso/Makefile @@ -1,8 +1,6 @@ # 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 the generic Makefile to check the built vdso. include $(srctree)/lib/vdso/Makefile # Symbols present in the vdso diff --git a/arch/loongarch/vdso/Makefile b/arch/loongarch/vdso/Makefile index d89e2ac75f7b..461240ab4436 100644 --- a/arch/loongarch/vdso/Makefile +++ b/arch/loongarch/vdso/Makefile @@ -1,9 +1,7 @@ # 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 the generic Makefile to check the built vdso. 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 18af9474ed0e..eb56581f6d73 100644 --- a/arch/mips/vdso/Makefile +++ b/arch/mips/vdso/Makefile @@ -4,9 +4,7 @@ # 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 the generic Makefile to check the built vdso. 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 66f723f53be2..4c3f34485f08 100644 --- a/arch/powerpc/kernel/vdso/Makefile +++ b/arch/powerpc/kernel/vdso/Makefile @@ -2,7 +2,7 @@ # 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 the generic Makefile to check the built vdso. 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 06e6b27f3bcc..a04b3bc35ca2 100644 --- a/arch/riscv/kernel/vdso/Makefile +++ b/arch/riscv/kernel/vdso/Makefile @@ -1,9 +1,7 @@ # 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 the generic Makefile to check the built vdso. 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..bafd3147eb4e 100644 --- a/arch/s390/kernel/vdso32/Makefile +++ b/arch/s390/kernel/vdso32/Makefile @@ -2,9 +2,8 @@ # 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 the generic Makefile to check the built vdso. 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 34f9542636e9..a766d286e15f 100644 --- a/arch/s390/kernel/vdso64/Makefile +++ b/arch/s390/kernel/vdso64/Makefile @@ -2,9 +2,8 @@ # 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 the generic Makefile to check the built vdso. include $(srctree)/lib/vdso/Makefile obj-vdso64 = vdso_user_wrapper.o note.o obj-cvdso64 = vdso64_generic.o getcpu.o diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile index 1506a22a4fb6..6a1821bd7d5e 100644 --- a/arch/x86/entry/vdso/Makefile +++ b/arch/x86/entry/vdso/Makefile @@ -3,10 +3,7 @@ # 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 the generic Makefile to check the built vdso. 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 e814061d6aa0..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 $@ | grep -E -h "$(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 -- 2.40.0.rc1.284.g88254d51c5-goog