From patchwork Tue Apr 27 20:47:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu-cheng Yu X-Patchwork-Id: 12227311 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 D6497C433ED for ; Tue, 27 Apr 2021 20:47:54 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 82EAE613E7 for ; Tue, 27 Apr 2021 20:47:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 82EAE613E7 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 632476B0078; Tue, 27 Apr 2021 16:47:51 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4936D6B00B1; Tue, 27 Apr 2021 16:47:51 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0E8626B007D; Tue, 27 Apr 2021 16:47:51 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0093.hostedemail.com [216.40.44.93]) by kanga.kvack.org (Postfix) with ESMTP id E876B6B0078 for ; Tue, 27 Apr 2021 16:47:50 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id B4D24180AD81D for ; Tue, 27 Apr 2021 20:47:50 +0000 (UTC) X-FDA: 78079333500.08.B0D443C Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by imf24.hostedemail.com (Postfix) with ESMTP id B8BDAA000189 for ; Tue, 27 Apr 2021 20:47:38 +0000 (UTC) IronPort-SDR: v93JYm5HJDqbl8yDTR2DCXlA9CYgTYyXWOeGuWbqnw3F+G0HEn5brJrzFYMMu7vDkbZbzpfb5q HhT5zRSjBq1w== X-IronPort-AV: E=McAfee;i="6200,9189,9967"; a="176706718" X-IronPort-AV: E=Sophos;i="5.82,255,1613462400"; d="scan'208";a="176706718" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Apr 2021 13:47:47 -0700 IronPort-SDR: iogEKj49eNEn3Jj98ysuiJ5T4AT3mLkPcsCQgfuMLmQNMskffVqisSeGgc3tRZuyOjt154vPhf 3YGKuAScx6dg== X-IronPort-AV: E=Sophos;i="5.82,255,1613462400"; d="scan'208";a="457835083" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Apr 2021 13:47:47 -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 , Pengfei Xu , Haitao Huang Cc: Yu-cheng Yu Subject: [PATCH v26 4/9] x86/cet/ibt: Update ELF header parsing for Indirect Branch Tracking Date: Tue, 27 Apr 2021 13:47:15 -0700 Message-Id: <20210427204720.25007-5-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20210427204720.25007-1-yu-cheng.yu@intel.com> References: <20210427204720.25007-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: B8BDAA000189 X-Stat-Signature: 9hiw9nf1wockr8ruz5t966c1xomimhxd Received-SPF: none (intel.com>: No applicable sender policy available) receiver=imf24; identity=mailfrom; envelope-from=""; helo=mga17.intel.com; client-ip=192.55.52.151 X-HE-DKIM-Result: none/none X-HE-Tag: 1619556458-961236 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: An ELF file's .note.gnu.property indicates features the file supports. The property is parsed at loading time and passed to arch_setup_elf_ property(). Update it for Indirect Branch Tracking. Signed-off-by: Yu-cheng Yu Cc: Kees Cook --- v24: - Update for changes introduced from splitting shadow stack and ibt. arch/x86/Kconfig | 2 ++ arch/x86/kernel/process_64.c | 8 ++++++++ 2 files changed, 10 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 6bb69fba0dad..7436e3a608e8 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1970,6 +1970,8 @@ config X86_IBT def_bool n depends on X86_SHADOW_STACK depends on $(cc-option,-fcf-protection) + select ARCH_USE_GNU_PROPERTY + select ARCH_BINFMT_ELF_STATE help Indirect Branch Tracking (IBT) provides protection against CALL-/JMP-oriented programming attacks. It is active when diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index d71045b29475..bf8ef10e5b78 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -864,6 +864,14 @@ int arch_setup_elf_property(struct arch_elf_state *state) r = shstk_setup(); } + if (r < 0) + return r; + + if (cpu_feature_enabled(X86_FEATURE_IBT)) { + if (state->gnu_property & GNU_PROPERTY_X86_FEATURE_1_IBT) + r = ibt_setup(); + } + return r; } #endif