From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl1-f198.google.com (mail-pl1-f198.google.com [209.85.214.198]) by kanga.kvack.org (Postfix) with ESMTP id D7B426B5242 for ; Thu, 30 Aug 2018 10:44:44 -0400 (EDT) Received: by mail-pl1-f198.google.com with SMTP id gn4so4066212plb.9 for ; Thu, 30 Aug 2018 07:44:44 -0700 (PDT) Received: from mga18.intel.com (mga18.intel.com. [134.134.136.126]) by mx.google.com with ESMTPS id t10-v6si6980653pgn.667.2018.08.30.07.44.43 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 30 Aug 2018 07:44:43 -0700 (PDT) From: Yu-cheng Yu Subject: [RFC PATCH v3 3/8] x86/cet/ibt: ELF header parsing for IBT Date: Thu, 30 Aug 2018 07:40:04 -0700 Message-Id: <20180830144009.3314-4-yu-cheng.yu@intel.com> In-Reply-To: <20180830144009.3314-1-yu-cheng.yu@intel.com> References: <20180830144009.3314-1-yu-cheng.yu@intel.com> Sender: owner-linux-mm@kvack.org List-ID: 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 , Cyrill Gorcunov , Dave Hansen , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , "Ravi V. Shankar" , Vedvyas Shanbhogue Cc: Yu-cheng Yu 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: H.J. Lu Signed-off-by: Yu-cheng Yu --- arch/x86/include/uapi/asm/elf_property.h | 1 + arch/x86/kernel/elf.c | 8 +++++++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/uapi/asm/elf_property.h b/arch/x86/include/uapi/asm/elf_property.h index af361207718c..343a871b8fc1 100644 --- a/arch/x86/include/uapi/asm/elf_property.h +++ b/arch/x86/include/uapi/asm/elf_property.h @@ -11,5 +11,6 @@ * Bits for GNU_PROPERTY_X86_FEATURE_1_AND */ #define GNU_PROPERTY_X86_FEATURE_1_SHSTK (0x00000002) +#define GNU_PROPERTY_X86_FEATURE_1_IBT (0x00000001) #endif /* _UAPI_ASM_X86_ELF_PROPERTY_H */ diff --git a/arch/x86/kernel/elf.c b/arch/x86/kernel/elf.c index a2c41bf39c58..41957f1bd9d0 100644 --- a/arch/x86/kernel/elf.c +++ b/arch/x86/kernel/elf.c @@ -298,7 +298,8 @@ int arch_setup_features(void *ehdr_p, void *phdr_p, struct elf64_hdr *ehdr64 = ehdr_p; - if (!cpu_feature_enabled(X86_FEATURE_SHSTK)) + if (!cpu_feature_enabled(X86_FEATURE_SHSTK) && + !cpu_feature_enabled(X86_FEATURE_IBT)) return 0; if (ehdr64->e_ident[EI_CLASS] == ELFCLASS64) { @@ -333,6 +334,11 @@ int arch_setup_features(void *ehdr_p, void *phdr_p, } } + if (cpu_feature_enabled(X86_FEATURE_IBT)) { + if (feature & GNU_PROPERTY_X86_FEATURE_1_IBT) + err = cet_setup_ibt(); + } + out: return err; } -- 2.17.1