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=-9.8 required=3.0 tests=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 A692DC32750 for ; Tue, 13 Aug 2019 21:04:04 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 71CAF20840 for ; Tue, 13 Aug 2019 21:04:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 71CAF20840 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 D9D616B029E; Tue, 13 Aug 2019 17:03:43 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D09126B029F; Tue, 13 Aug 2019 17:03:43 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8784C6B02A1; Tue, 13 Aug 2019 17:03:43 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0190.hostedemail.com [216.40.44.190]) by kanga.kvack.org (Postfix) with ESMTP id 42EEB6B029F for ; Tue, 13 Aug 2019 17:03:43 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id E0C5A8248AA1 for ; Tue, 13 Aug 2019 21:03:42 +0000 (UTC) X-FDA: 75818631084.08.owl02_205d5799c5533 X-HE-Tag: owl02_205d5799c5533 X-Filterd-Recvd-Size: 3338 Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by imf22.hostedemail.com (Postfix) with ESMTP for ; Tue, 13 Aug 2019 21:03:42 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Aug 2019 14:03:40 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,382,1559545200"; d="scan'208";a="194275975" Received: from yyu32-desk1.sc.intel.com ([10.144.153.205]) by fmsmga001.fm.intel.com with ESMTP; 13 Aug 2019 14:03:40 -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 Cc: Yu-cheng Yu Subject: [PATCH v8 05/14] x86/cet/ibt: ELF header parsing for IBT Date: Tue, 13 Aug 2019 13:53:50 -0700 Message-Id: <20190813205359.12196-6-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190813205359.12196-1-yu-cheng.yu@intel.com> References: <20190813205359.12196-1-yu-cheng.yu@intel.com> 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: Look in .note.gnu.property of an ELF file and check if Indirect Branch Tracking needs to be enabled for the task. Signed-off-by: Yu-cheng Yu --- arch/x86/Kconfig | 1 + arch/x86/kernel/process_64.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 666dc66a382e..7edb544cef00 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1971,6 +1971,7 @@ config X86_INTEL_BRANCH_TRACKING_USER select X86_INTEL_CET select ARCH_HAS_AS_LIMIT select ARCH_USE_GNU_PROPERTY + select ARCH_BINFMT_ELF_STATE ---help--- Indirect Branch Tracking provides hardware protection against return-/jmp- oriented programming attacks. diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 7ec60b14e96d..a051cfc5242f 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -856,6 +856,11 @@ int arch_setup_property(struct arch_elf_state *state) return r; } + if (cpu_feature_enabled(X86_FEATURE_IBT)) { + if (state->gnu_property & GNU_PROPERTY_X86_FEATURE_1_IBT) + r = cet_setup_ibt(); + } + return r; } #endif -- 2.17.1