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=unavailable 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 6D79BC83000 for ; Wed, 29 Apr 2020 22:09:33 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 31B0D2137B for ; Wed, 29 Apr 2020 22:09:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 31B0D2137B 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 4E1478E001A; Wed, 29 Apr 2020 18:08:57 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2893B8E001E; Wed, 29 Apr 2020 18:08:57 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0FF2A8E001A; Wed, 29 Apr 2020 18:08:57 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0206.hostedemail.com [216.40.44.206]) by kanga.kvack.org (Postfix) with ESMTP id E41E88E001D for ; Wed, 29 Apr 2020 18:08:56 -0400 (EDT) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id A849C180AD815 for ; Wed, 29 Apr 2020 22:08:56 +0000 (UTC) X-FDA: 76762283472.09.sun16_13ca55e09063c X-HE-Tag: sun16_13ca55e09063c X-Filterd-Recvd-Size: 5130 Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by imf22.hostedemail.com (Postfix) with ESMTP for ; Wed, 29 Apr 2020 22:08:55 +0000 (UTC) IronPort-SDR: E/qsk0NWcOzE4CL2ZP6ObwOH+0fYK3RNAmn9FpIC3FlZoP9U2T85bxciice2K8WoGxQFpcagIB 2EFq0UObjOpw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2020 15:08:54 -0700 IronPort-SDR: hCpBR8JgmBUArba48RcnGTPFc5gh6uFPvXCw7CalaqG7T7/E46TXDiTalLMUPIIFuAM8DGo8v2 lWvfarYOuZHQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,333,1583222400"; d="scan'208";a="276308937" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by orsmga002.jf.intel.com with ESMTP; 29 Apr 2020 15:08:54 -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 v10 24/26] x86/cet/shstk: ELF header parsing for shadow stack Date: Wed, 29 Apr 2020 15:07:30 -0700 Message-Id: <20200429220732.31602-25-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200429220732.31602-1-yu-cheng.yu@intel.com> References: <20200429220732.31602-1-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: Check an ELF file's .note.gnu.property, and setup shadow stack if the application supports it. Signed-off-by: Yu-cheng Yu --- v9: - Change cpu_feature_enabled() to static_cpu_has(). arch/x86/Kconfig | 2 ++ arch/x86/include/asm/elf.h | 13 +++++++++++++ arch/x86/kernel/process_64.c | 29 +++++++++++++++++++++++++++++ 3 files changed, 44 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index ac07e1f6a2bc..8b7b97ff5fb4 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1970,6 +1970,8 @@ config X86_INTEL_SHADOW_STACK_USER select X86_INTEL_CET select ARCH_MAYBE_MKWRITE select ARCH_HAS_SHADOW_STACK + select ARCH_USE_GNU_PROPERTY + select ARCH_BINFMT_ELF_STATE help Shadow Stacks provides protection against program stack corruption. It's a hardware feature. This only matters diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h index 69c0f892e310..fac79b621e0a 100644 --- a/arch/x86/include/asm/elf.h +++ b/arch/x86/include/asm/elf.h @@ -367,6 +367,19 @@ extern int compat_arch_setup_additional_pages(struct= linux_binprm *bprm, int uses_interp); #define compat_arch_setup_additional_pages compat_arch_setup_additional_= pages =20 +#ifdef CONFIG_ARCH_BINFMT_ELF_STATE +struct arch_elf_state { + unsigned int gnu_property; +}; + +#define INIT_ARCH_ELF_STATE { \ + .gnu_property =3D 0, \ +} + +#define arch_elf_pt_proc(ehdr, phdr, elf, interp, state) (0) +#define arch_check_elf(ehdr, interp, interp_ehdr, state) (0) +#endif + /* Do not change the values. See get_align_mask() */ enum align_flags { ALIGN_VA_32 =3D BIT(0), diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 5ef9d8f25b0e..93ba4afd0c19 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -730,3 +730,32 @@ unsigned long KSTK_ESP(struct task_struct *task) { return task_pt_regs(task)->sp; } + +#ifdef CONFIG_ARCH_USE_GNU_PROPERTY +int arch_parse_elf_property(u32 type, const void *data, size_t datasz, + bool compat, struct arch_elf_state *state) +{ + if (type !=3D GNU_PROPERTY_X86_FEATURE_1_AND) + return 0; + + if (datasz !=3D sizeof(unsigned int)) + return -ENOEXEC; + + state->gnu_property =3D *(unsigned int *)data; + return 0; +} + +int arch_setup_elf_property(struct arch_elf_state *state) +{ + int r =3D 0; + + memset(¤t->thread.cet, 0, sizeof(struct cet_status)); + + if (static_cpu_has(X86_FEATURE_SHSTK)) { + if (state->gnu_property & GNU_PROPERTY_X86_FEATURE_1_SHSTK) + r =3D cet_setup_shstk(); + } + + return r; +} +#endif --=20 2.21.0