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=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 0E3F7C433E4 for ; Tue, 25 Aug 2020 00:30:52 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CD5A82065F for ; Tue, 25 Aug 2020 00:30:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CD5A82065F 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 7FEF5900017; Mon, 24 Aug 2020 20:30:39 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 76222900010; Mon, 24 Aug 2020 20:30:39 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6276B900016; Mon, 24 Aug 2020 20:30:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0132.hostedemail.com [216.40.44.132]) by kanga.kvack.org (Postfix) with ESMTP id 4A701900010 for ; Mon, 24 Aug 2020 20:30:39 -0400 (EDT) Received: from smtpin28.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 17821180AD815 for ; Tue, 25 Aug 2020 00:30:39 +0000 (UTC) X-FDA: 77187210198.28.aunt62_2608d7827057 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin28.hostedemail.com (Postfix) with ESMTP id D7E086D62 for ; Tue, 25 Aug 2020 00:30:38 +0000 (UTC) X-HE-Tag: aunt62_2608d7827057 X-Filterd-Recvd-Size: 3687 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by imf21.hostedemail.com (Postfix) with ESMTP for ; Tue, 25 Aug 2020 00:30:38 +0000 (UTC) IronPort-SDR: MU8vUAYKtPqmkTzCrXd2vowVAVjt1msieQmXPOA7zdE6qtL1iAK/R1oHFE/mbTMWK/bF5E4dIb yrQYJGrVZ+8A== X-IronPort-AV: E=McAfee;i="6000,8403,9723"; a="143794766" X-IronPort-AV: E=Sophos;i="5.76,350,1592895600"; d="scan'208";a="143794766" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Aug 2020 17:30:37 -0700 IronPort-SDR: CZm3evfZq44Iuma7t7gzSLCDG2cHQ7o1phBaZEox/ofJXa60prL8D8E403ktCzTNSEgX7s4fhO Zc0d8Ug5grWQ== X-IronPort-AV: E=Sophos;i="5.76,350,1592895600"; d="scan'208";a="443429337" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Aug 2020 17:30:37 -0700 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 Cc: Yu-cheng Yu Subject: [PATCH v11 8/9] x86/vdso: Insert endbr32/endbr64 to vDSO Date: Mon, 24 Aug 2020 17:26:43 -0700 Message-Id: <20200825002645.3658-9-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200825002645.3658-1-yu-cheng.yu@intel.com> References: <20200825002645.3658-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: D7E086D62 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 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 215376d975a2..82f8e25e139f 100644 --- a/arch/x86/entry/vdso/Makefile +++ b/arch/x86/entry/vdso/Makefile @@ -130,6 +130,10 @@ $(obj)/%-x32.o: $(obj)/%.o FORCE =20 targets +=3D vdsox32.lds $(vobjx32s-y) =20 +ifdef CONFIG_X86_INTEL_BRANCH_TRACKING_USER + $(obj)/vclock_gettime.o $(obj)/vgetcpu.o $(obj)/vdso32/vclock_gettim= e.o: KBUILD_CFLAGS +=3D -fcf-protection=3Dbranch +endif + $(obj)/%.so: OBJCOPYFLAGS :=3D -S $(obj)/%.so: $(obj)/%.so.dbg FORCE $(call if_changed,objcopy) --=20 2.21.0