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=-26.2 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 A6D67C64E75 for ; Wed, 18 Nov 2020 22:08:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 47AA4246F3 for ; Wed, 18 Nov 2020 22:08:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Nd7GPjj0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727624AbgKRWIf (ORCPT ); Wed, 18 Nov 2020 17:08:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53846 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727396AbgKRWHx (ORCPT ); Wed, 18 Nov 2020 17:07:53 -0500 Received: from mail-qv1-xf4a.google.com (mail-qv1-xf4a.google.com [IPv6:2607:f8b0:4864:20::f4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CFEAAC061A51 for ; Wed, 18 Nov 2020 14:07:53 -0800 (PST) Received: by mail-qv1-xf4a.google.com with SMTP id 60so2506253qvb.15 for ; Wed, 18 Nov 2020 14:07:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=bMl2xGwOyye8qFQQO5LhDpDmrDsCMs58eGZcnuWlmjA=; b=Nd7GPjj0ywkFIgMBmhds53YYdSle4acSaIFPLbVd61W8stSkNuoz0WxEayV/OD+juR 7iFFwAf5WeBqFMYZtbNZKvYarFFEIh0TRBfk8yozSVYTyizaOQn7nV/yOM5qfxhN6W3x F41WPEwVNkENBqTup7x2SW7FaXclkPY/jek8JoLFOskeSCczH+BvXJtXBg4dfeqkMd7O 5Jgsz0yx51vX7weJ6s9P7KIXrk46KNMTxH11C5CzpPEqWRCRyIwkXB16YTNgAiWSsV8M KuNdy4S5hjgNwFDrtraKFHI+LKTEBWBcWNWdPZnYpkQRqJAXNOz0JKEptCIRYdyLVRVY EmzQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=bMl2xGwOyye8qFQQO5LhDpDmrDsCMs58eGZcnuWlmjA=; b=JNt5ey6kXTDDeoTHih6MZksPNNxx/LpGWUjbhEuJmZQDhu/cxdVSQ3I2QsJanDLfHY OOmM7lglvI6bz6Y9fCXoNhL9B9UFbI31a/Il6jAdQP+KWB53YBe4E2aP1zSXNNOMO2TO QLTbK6UpeT6Vwp8m7ntUBTvJeCyn0Z+fXbR9cBiS1yLsEPCcF43Px05GbwuAYFzExgEp OU2/eYmU0nPOhP9pF5FcstcYKHZ4Q8rc36H3XVmFhOApaXkD9LASaivTL/hMFc3q4wAF ZNj8oXzdmfycMqZ8CHu8EJn+M4/EoTqwN+FmInzYAOF8eXK6Yzs4uaWNneYwDQ6OtXPF mv0w== X-Gm-Message-State: AOAM531XVjrdBmL2dnHeRM+wtAKMRblJBuIKHHpas5iL3lFBzD1ccVVJ ehMpkNUrwWL8+hDkZHxNdPLRCKgYpox6YnLoBdY= X-Google-Smtp-Source: ABdhPJw3XblGH0ype4DsebvgJ6qN/grSpkQ1FW0TAdSpMqPujHMfKBlR5uzuC4pXuA1vl9up5ivNoLV3rdGadkF867U= Sender: "samitolvanen via sendgmr" X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a0c:a94b:: with SMTP id z11mr3035952qva.24.1605737272927; Wed, 18 Nov 2020 14:07:52 -0800 (PST) Date: Wed, 18 Nov 2020 14:07:23 -0800 In-Reply-To: <20201118220731.925424-1-samitolvanen@google.com> Message-Id: <20201118220731.925424-10-samitolvanen@google.com> Mime-Version: 1.0 References: <20201118220731.925424-1-samitolvanen@google.com> X-Mailer: git-send-email 2.29.2.454.gaff20da3a2-goog Subject: [PATCH v7 09/17] PCI: Fix PREL32 relocations for LTO From: Sami Tolvanen To: Masahiro Yamada , Steven Rostedt , Will Deacon Cc: Josh Poimboeuf , Peter Zijlstra , Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , Nick Desaulniers , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Sami Tolvanen Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With Clang's Link Time Optimization (LTO), the compiler can rename static functions to avoid global naming collisions. As PCI fixup functions are typically static, renaming can break references to them in inline assembly. This change adds a global stub to DECLARE_PCI_FIXUP_SECTION to fix the issue when PREL32 relocations are used. Signed-off-by: Sami Tolvanen Acked-by: Bjorn Helgaas Reviewed-by: Kees Cook --- include/linux/pci.h | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/include/linux/pci.h b/include/linux/pci.h index 22207a79762c..5b8505a5ca5f 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1912,19 +1912,28 @@ enum pci_fixup_pass { }; #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS -#define __DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \ - class_shift, hook) \ - __ADDRESSABLE(hook) \ +#define ___DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \ + class_shift, hook, stub) \ + void stub(struct pci_dev *dev); \ + void stub(struct pci_dev *dev) \ + { \ + hook(dev); \ + } \ asm(".section " #sec ", \"a\" \n" \ ".balign 16 \n" \ ".short " #vendor ", " #device " \n" \ ".long " #class ", " #class_shift " \n" \ - ".long " #hook " - . \n" \ + ".long " #stub " - . \n" \ ".previous \n"); + +#define __DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \ + class_shift, hook, stub) \ + ___DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \ + class_shift, hook, stub) #define DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \ class_shift, hook) \ __DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \ - class_shift, hook) + class_shift, hook, __UNIQUE_ID(hook)) #else /* Anonymous variables would be nice... */ #define DECLARE_PCI_FIXUP_SECTION(section, name, vendor, device, class, \ -- 2.29.2.299.gdc1121823c-goog