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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 0341EC433E9 for ; Wed, 3 Feb 2021 22:59:54 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 934CA64F74 for ; Wed, 3 Feb 2021 22:59:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 934CA64F74 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id AC7326B0089; Wed, 3 Feb 2021 17:59:45 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 93D798D0005; Wed, 3 Feb 2021 17:59:45 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 654FB6B008C; Wed, 3 Feb 2021 17:59:45 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0159.hostedemail.com [216.40.44.159]) by kanga.kvack.org (Postfix) with ESMTP id 214098D0007 for ; Wed, 3 Feb 2021 17:59:45 -0500 (EST) Received: from smtpin30.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id E372D181AEF15 for ; Wed, 3 Feb 2021 22:59:44 +0000 (UTC) X-FDA: 77778475488.30.soup28_3d138dd275d7 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin30.hostedemail.com (Postfix) with ESMTP id BC50D180B3C83 for ; Wed, 3 Feb 2021 22:59:44 +0000 (UTC) X-HE-Tag: soup28_3d138dd275d7 X-Filterd-Recvd-Size: 3588 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by imf40.hostedemail.com (Postfix) with ESMTP for ; Wed, 3 Feb 2021 22:59:43 +0000 (UTC) IronPort-SDR: FAnvuKa3O56tN7ujfjiN2EdKMK7bBhVwvpiLLs+pJ/OD++BWN2TsUQpec5Rgo7rEpz4OWWTkk5 OHU7qlcTsGNQ== X-IronPort-AV: E=McAfee;i="6000,8403,9884"; a="160892378" X-IronPort-AV: E=Sophos;i="5.79,399,1602572400"; d="scan'208";a="160892378" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Feb 2021 14:59:43 -0800 IronPort-SDR: HKyLgSeePrWa9UUvtrIEA/AJaKsT0VkROxeCWAPLsUYgTiJDmXCLhNurah2ITnFnhc+m8++NQH xpPyd3dLjJbg== X-IronPort-AV: E=Sophos;i="5.79,399,1602572400"; d="scan'208";a="392698034" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Feb 2021 14:59:42 -0800 From: Yu-cheng Yu To: x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu Cc: Yu-cheng Yu Subject: [PATCH v19 7/7] x86/vdso: Insert endbr32/endbr64 to vDSO Date: Wed, 3 Feb 2021 14:59:02 -0800 Message-Id: <20210203225902.479-8-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20210203225902.479-1-yu-cheng.yu@intel.com> References: <20210203225902.479-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: "H.J. Lu" When Indirect Branch Tracking (IBT) is enabled, vDSO functions may be called indirectly, and must have ENDBR32 or ENDBR64 as the first instruction. The compiler must support -fcf-protection=3Dbranch so that = it can be used to compile vDSO. Signed-off-by: H.J. Lu Signed-off-by: Yu-cheng Yu Acked-by: Andy Lutomirski --- arch/x86/entry/vdso/Makefile | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile index 02e3e42f380b..ff7b56feb5c3 100644 --- a/arch/x86/entry/vdso/Makefile +++ b/arch/x86/entry/vdso/Makefile @@ -93,6 +93,10 @@ endif =20 $(vobjs): KBUILD_CFLAGS :=3D $(filter-out $(GCC_PLUGINS_CFLAGS) $(RETPOL= INE_CFLAGS),$(KBUILD_CFLAGS)) $(CFL) =20 +ifdef CONFIG_X86_CET +$(vobjs) $(vobjs32): KBUILD_CFLAGS +=3D -fcf-protection=3Dbranch +endif + # # vDSO code runs in userspace and -pg doesn't help with profiling anyway= . # --=20 2.21.0