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 X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0193FC433E3 for ; Fri, 21 Aug 2020 19:55:43 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C039720738 for ; Fri, 21 Aug 2020 19:55:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="gs8iVZeq"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="MOtH6g06" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C039720738 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=qzof/fhz5BrSYdxb0ugaGU2r5MlioDzmOKBJk0RIZEI=; b=gs8iVZeqDl7n/N7eG0Hq/AtND RETrfflVIJk1yy4rujKlNoEstNvyCrOuw+iumS/ULXGBusiYBkCYAKBD5Lc6hRyxuFYVPu8WQApGb x/gSY9YwGTlOSpqrZuusigT0Xs8smOXd2lrCakWhaLRhPvKk0VQ50x8C2k685fUKM1dgEGTL+VHCJ ZC3D73baDtWMtUPpJ+Y6p/uyYPtfOsJxho78Yr3jJTLrZhnFLaYBd0Z3ADqSQ/rjHylGVZxFAIECI nbzvjuOwJY9TjCnK5N8IjPucgt3sz8TZMViwoaHt+CI5xcAqu3ZRvznxT/n8rdtpFnihL5eIKkWzA acmbmzIAA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1k9D74-0003AJ-Ci; Fri, 21 Aug 2020 19:54:10 +0000 Received: from mail-pf1-x442.google.com ([2607:f8b0:4864:20::442]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1k9D6w-00033g-SN for linux-arm-kernel@lists.infradead.org; Fri, 21 Aug 2020 19:54:03 +0000 Received: by mail-pf1-x442.google.com with SMTP id f193so1564939pfa.12 for ; Fri, 21 Aug 2020 12:54:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=cKGWDIrBEs2dh6Vx6JHQWt/T3ziuaJ6+D++qA+lLK7w=; b=MOtH6g06WVQoxhMiwvjXdIDUiCnhNQLZstpkLeL0aigF1WIuztgjF/SOV6mc40YW8E wDHh058AHq5ePmSwdD2DjlRGgSmRaxVSd4mi0Zx9sor/UExqSvQ8V/L8d0p9DL/TQe7y p5lo8dxel2Zghjrb75dYwEndSMILJRoFoM+74= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=cKGWDIrBEs2dh6Vx6JHQWt/T3ziuaJ6+D++qA+lLK7w=; b=MlahpTiv1BOl9hleyWS+N3epxpgftT0THs3WNVUaE8hofVM8y/rfQ0dlJLZadUlLM4 wEolyZ0YGsOTbawqoPp6I9LIYPPuohlDxUp3TuskuBBkLjmrUmpR4JfHBIOrp69KrNyM aLpOFc9ozfZ3YoD5qNLH3n13tNDuUSdjOjjzbFc7Zm6+XmNq1rg64fV0BeMYRvnYGN5n UOO/goRysDYXV/ddUga2mwSHwexUGd9iuC/L0uDNmxfvUkF27FdtZdfqA+DYtnEY9HdP znymh5lBmTP2aORyLmZNeT30Vc6sW9TG4coiMQaK0HBlTd9X/PGqfP5IvscQEPh/UA6A KaLw== X-Gm-Message-State: AOAM530yjSn6RWihyJwDdQ+7vay2FPhcIaUIlpTL+pyFDjUNdFbQytz+ t03o7IkHGFLCrtV8ZM0GFZWGUg== X-Google-Smtp-Source: ABdhPJxjgtmoBh+TjhY4jwZBRLmOO/t4+4cu+yIFtjbg4mFY0zXTI5TZCcanxWTLjoIsmfezhzbI5w== X-Received: by 2002:aa7:968b:: with SMTP id f11mr3724767pfk.63.1598039640596; Fri, 21 Aug 2020 12:54:00 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id k29sm3378601pfp.142.2020.08.21.12.53.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Aug 2020 12:53:59 -0700 (PDT) From: Kees Cook To: Ingo Molnar Subject: [PATCH v6 19/29] arm/build: Warn on orphan section placement Date: Fri, 21 Aug 2020 12:43:00 -0700 Message-Id: <20200821194310.3089815-20-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200821194310.3089815-1-keescook@chromium.org> References: <20200821194310.3089815-1-keescook@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200821_155402_943382_D6690479 X-CRM114-Status: GOOD ( 12.53 ) 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 , Catalin Marinas , Masahiro Yamada , x86@kernel.org, Nick Desaulniers , Russell King , linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Arvind Sankar , Ingo Molnar , James Morse , Nathan Chancellor , Borislav Petkov , Peter Collingbourne , 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 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 handled 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' With all sections handled, enable orphan section warning. Reviewed-by: Nick Desaulniers Signed-off-by: Kees Cook --- arch/arm/Makefile | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 4e877354515f..0aa133c4ddec 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -16,6 +16,10 @@ LDFLAGS_vmlinux += --be8 KBUILD_LDFLAGS_MODULE += --be8 endif +# We never want expected sections to be placed heuristically by the +# linker. All sections should be explicitly named in the linker script. +LDFLAGS_vmlinux += --orphan-handling=warn + ifeq ($(CONFIG_ARM_MODULE_PLTS),y) KBUILD_LDS_MODULE += $(srctree)/arch/arm/kernel/module.lds endif -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel