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=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 205C9C4363D for ; Fri, 9 Oct 2020 16:14:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D11C12227F for ; Fri, 9 Oct 2020 16:14:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="E5G/sJ81" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389785AbgJIQOZ (ORCPT ); Fri, 9 Oct 2020 12:14:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41484 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389750AbgJIQOT (ORCPT ); Fri, 9 Oct 2020 12:14:19 -0400 Received: from mail-qk1-x749.google.com (mail-qk1-x749.google.com [IPv6:2607:f8b0:4864:20::749]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 87822C0613AC for ; Fri, 9 Oct 2020 09:14:15 -0700 (PDT) Received: by mail-qk1-x749.google.com with SMTP id u2so7154234qka.2 for ; Fri, 09 Oct 2020 09:14:15 -0700 (PDT) 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=b5rCnYz4obhAgpKHq4mgEn5Hvv5UPGIbAlGkTv5aKg4=; b=E5G/sJ81fFEbU3UrV/4DwBfDWW8suW611A0G6/DwYfbR04ohtV708reO0SJgwS2rf7 bSqsXq3OjK2yL1hKhQfhwZRZ5aBj98+xPOc+UFD8lX0GapobLOFhUzyy2r2Ix8ArAd0p mGmDn3PZkPNl1b/DlynJoS1L8xMBaXaj6SJ35+lWUlg4xMQamvtjXzlzzct2MoZ5wPyM MNKTdnp/zeU1v9mmBSvDZzYwOLTZJr2sWDxiglMg0b83/FZMs4lgJsucTLS60ojx171N 0Z36nkDB3h5N6Ml8sbsV3TfqqbNBcSFUY1hiHFHCfLLxtVk4pfMm91HtyPzFHHq4SRa4 QS5Q== 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=b5rCnYz4obhAgpKHq4mgEn5Hvv5UPGIbAlGkTv5aKg4=; b=TBdWO9ngfOwrrGRtOUjGijsmYD8fAq3kD9btNsNuZHf6rlbA6meN4+vZ5/J4DQRfzI BfKtM9A80s0UZvKlho9mLkCYY+2Pts9T/gjdrfK6JQK69ZCgOGEqK/iigatA0XJ3Ghb0 SvwwnGOKdaehxxrGGOXBcPgbSwsH26p3z7iD0RAQ264gNNWuoGmoYF6vmZ104ewtlgrZ fh8wqhihI+hJBVYfwhSiyXTV4Qsw/tkYs8WxMfULZixfdFgkemC0tccL1aJSo4mvr5q4 FGC2kb5hWEboAH3pei17G0el9vGU2poLLxBy4dYwdmW8IrDW6/J9NhVyIRw32YYagi3S DzCQ== X-Gm-Message-State: AOAM532pfXc0wIIYxHiAhuNH3pIwT7E4+QxkjzHGKxwIvSftbrf7I+yz OoZGrzCibjWf0x7ZeIyBmK0GBz4vp4BT2cC5rb0= X-Google-Smtp-Source: ABdhPJxUsLNRYd2SDtvgB7CmXqlcp3vGOaCoLMxBFjkUgYB81ry88e1Q7zWE2vdzY9Ol+dTKaZMDIAjVS73Q6wHF4BA= 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:a05:6214:122a:: with SMTP id p10mr14125090qvv.0.1602260054668; Fri, 09 Oct 2020 09:14:14 -0700 (PDT) Date: Fri, 9 Oct 2020 09:13:26 -0700 In-Reply-To: <20201009161338.657380-1-samitolvanen@google.com> Message-Id: <20201009161338.657380-18-samitolvanen@google.com> Mime-Version: 1.0 References: <20201009161338.657380-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog Subject: [PATCH v5 17/29] PCI: Fix PREL32 relocations for LTO From: Sami Tolvanen To: Masahiro Yamada , Will Deacon , Steven Rostedt Cc: 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, x86@kernel.org, Sami Tolvanen Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-arch@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 835530605c0d..4e64421981c7 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1909,19 +1909,28 @@ 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, \ -- 2.28.0.1011.ga647a8990f-goog