From patchwork Tue Dec 1 21:37:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11943977 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=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 EDB3DC64E7A for ; Tue, 1 Dec 2020 21:38:49 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id E6429208C3 for ; Tue, 1 Dec 2020 21:38:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="gzp1vYR/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E6429208C3 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-20497-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 17807 invoked by uid 550); 1 Dec 2020 21:37:45 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 17717 invoked from network); 1 Dec 2020 21:37:44 -0000 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=B5HJdqCXUeL43UIVLVZJnxtwrYZ/thw26FrV4EWKXXk=; b=gzp1vYR/oXkNJrTfyPC+gU9AshMDJf17d4hXlEixyq63WSCsKKx3kDXJjLE3705Nyq Fo5ieQYTx2JVLwmaGskMvm1+jyZULJ03SfEv9yykRb2g73uRagV1yTPJy+ahrYRV99Qs VfiuyAzo5OTZaK2vNHAaDjnnZkvg7bkbVueCSfy5zymqb9Zl9C2ZImkyynaqirPNK6ba e2o6MqYUTsj7xpc/+jQAgUOMDI+fKOFd22bNsjjuBqWiITez5IABxAqzwCC3dIQDnjj5 6X3ijsy0/J/N0HG3BH/CFt5ycSFf4nlbPH4Q6tCHT2m9Fj3AbeddPFsPWCTDAPwl02q1 wRIQ== 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=B5HJdqCXUeL43UIVLVZJnxtwrYZ/thw26FrV4EWKXXk=; b=jVeUmG4r0To4pMEzuJPoASO065s7dWVcZrcwIrK8OM0sQMJaAd1pujiVg24hDi+4Wt p0xGbwgM7Ol48LYzIarZ9Exfe85N/m2enD9NplGs9cPy8M1jn2H3EYlNJBxRDlss4Hbh VXK3Juc0NI8eMZp3lIf3QN38YmBB9rpIXMCte0zXub4J2dCe0NHRZ8z69dQeA8EbPAWc ed2e8k2t0Xs6XgQFL+plniqUOfN62b9UNB5nRnEQ+jdKnMr7JHu88fR22nvYsJkQ0BB6 CtRkQHtJqPcrrKM5pkINpUnT1RQH4YG5Imn9c2ytahoXvnVUvQTnGLcgMSPppXMnFs+d 8+qw== X-Gm-Message-State: AOAM532uIoH3/bKvp8tpyf+y+m6yQRU1laPaQMaqb0F3TnuA64Qyr3X1 pbSl0AqnK3fVyi42wMYZ8aQZVHUZClpU31ZpEro= X-Google-Smtp-Source: ABdhPJyOyTY3dsog0bEyrf8FQNmA+LgDAtxW1LSmGP4jpoGSceI7DnRj4mOHZ3s0UwiUKjNjBIGpuS4DR9GRfrOYGf0= 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:a25:4189:: with SMTP id o131mr7599389yba.95.1606858652596; Tue, 01 Dec 2020 13:37:32 -0800 (PST) Date: Tue, 1 Dec 2020 13:37:00 -0800 In-Reply-To: <20201201213707.541432-1-samitolvanen@google.com> Message-Id: <20201201213707.541432-10-samitolvanen@google.com> Mime-Version: 1.0 References: <20201201213707.541432-1-samitolvanen@google.com> X-Mailer: git-send-email 2.29.2.576.ga3fc446d84-goog Subject: [PATCH v8 09/16] 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 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, \