From patchwork Tue Sep 29 21:46:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11807101 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 87D4A13B2 for ; Tue, 29 Sep 2020 21:48:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 610D6208FE for ; Tue, 29 Sep 2020 21:48:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ZTQa+nx+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729377AbgI2VsG (ORCPT ); Tue, 29 Sep 2020 17:48:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48196 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728560AbgI2Vqu (ORCPT ); Tue, 29 Sep 2020 17:46:50 -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 83B07C061755 for ; Tue, 29 Sep 2020 14:46:50 -0700 (PDT) Received: by mail-qk1-x749.google.com with SMTP id a2so3678405qkg.19 for ; Tue, 29 Sep 2020 14:46:50 -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=wzTjCzGg3xaEC7ll/kCd4uRGsOqMFFvk2QDCKEKZJPs=; b=ZTQa+nx+ie2V6Hl+EgZ3b9a4nWf6aHDxI2ozXvg7twHaKP6+FN6wo15J3NYUHL6MZy J4Dd+alK6yoV9vbFjsbkRKSroxIwAfTac5LcIIobI37oTx5CMMXDG5PaPNUMt11LwL8e qaWpUR1BPcieUI39Ur38/bJEEGCMg2IEQV7e2ugbrGtg++DfsB4wweV1KXsP1t+8DXDm JeGZ4Z7BrxXuG2djrCReKQukEvOz+cyKSm1LRUENFyizVwreuzCNtUFRYYSNx4ge/Lh7 V+phKEE5IsRMyJIFN5ljmvpZV5Qkvt76Ais9ZtPypytr0PvQL98a/0aQ5/yCoymbWkrC MGDQ== 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=wzTjCzGg3xaEC7ll/kCd4uRGsOqMFFvk2QDCKEKZJPs=; b=F9jQAqwTwNxESwKzXkG/fm9C263SOaZisqr/3p/Z9rmZ5hhivoyxF2D4kTbPvpl/wB agsudjtqfRvI3gywiWXmSAs48pgQLAl+rWNFG6Bfvb48iHVK5yLOAuZ/FrPikUhEU5KV lGmdYv8h68wvzmBhgDF6ER7a+8jlb4Qafpk1vup8t+95zQBJQcWAvyTqJ9ZiJwlEGbJz D6ecwFCoItlRxh1kuYKg9wPAXGFiDIwNVl6BHOYhtP7g8gAVD1Y6Zj06ZHAGJQgQzKKK stAmQO0QA/qKxegpqHYT4A4y4m92uJJxse2FgjKEqRGvafLFjKAiLM5WFyn5q27AF/Dg 6csA== X-Gm-Message-State: AOAM531i4ZX/RSsrGmLiHcbOK5xq51I3fmOGoc2Ir7Ot61+R97WPftQL iYp2dd+UOjom8C0HH0bQzkoPOT/FM6ShkBJpZ7M= X-Google-Smtp-Source: ABdhPJz2ypRSC9mllfNnIhgyfpZXn6C3IOzuDT16CdCuKPyuF6U9OOcO8z3rZ0bOQ0QtPSPEFo5uPG0gQq+yj7Gtb6I= 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:ad4:58e3:: with SMTP id di3mr6759116qvb.54.1601416009709; Tue, 29 Sep 2020 14:46:49 -0700 (PDT) Date: Tue, 29 Sep 2020 14:46:10 -0700 In-Reply-To: <20200929214631.3516445-1-samitolvanen@google.com> Message-Id: <20200929214631.3516445-9-samitolvanen@google.com> Mime-Version: 1.0 References: <20200929214631.3516445-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.709.gb0816b6eb0-goog Subject: [PATCH v4 08/29] x86, build: use objtool mcount 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 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Select HAVE_OBJTOOL_MCOUNT if STACK_VALIDATION is selected to use objtool to generate __mcount_loc sections for dynamic ftrace with Clang and gcc <5 (later versions of gcc use -mrecord-mcount). Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- arch/x86/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 7101ac64bb20..6de2e5c0bdba 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -163,6 +163,7 @@ config X86 select HAVE_CMPXCHG_LOCAL select HAVE_CONTEXT_TRACKING if X86_64 select HAVE_C_RECORDMCOUNT + select HAVE_OBJTOOL_MCOUNT if STACK_VALIDATION select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS select HAVE_DYNAMIC_FTRACE