From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-5.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable autolearn_force=no version=3.4.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id 9394A7D08C for ; Thu, 7 Jun 2018 15:43:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933987AbeFGPnk (ORCPT ); Thu, 7 Jun 2018 11:43:40 -0400 Received: from mga09.intel.com ([134.134.136.24]:36344 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934259AbeFGOl3 (ORCPT ); Thu, 7 Jun 2018 10:41:29 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Jun 2018 07:41:28 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,486,1520924400"; d="scan'208";a="62632615" Received: from 2b52.sc.intel.com ([143.183.136.51]) by orsmga001.jf.intel.com with ESMTP; 07 Jun 2018 07:41:28 -0700 From: Yu-cheng Yu To: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , "H.J. Lu" , Vedvyas Shanbhogue , "Ravi V. Shankar" , Dave Hansen , Andy Lutomirski , Jonathan Corbet , Oleg Nesterov , Arnd Bergmann , Mike Kravetz Cc: Yu-cheng Yu Subject: [PATCH 00/10] Control Flow Enforcement - Part (3) Date: Thu, 7 Jun 2018 07:37:57 -0700 Message-Id: <20180607143807.3611-1-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.15.1 Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org This series introduces CET - Shadow stack At the high level, shadow stack is: Allocated from a task's address space with vm_flags VM_SHSTK; Its PTEs must be read-only and dirty; Fixed sized, but the default size can be changed by sys admin. For a forked child, the shadow stack is duplicated when the next shadow stack access takes place. For a pthread child, a new shadow stack is allocated. The signal handler uses the same shadow stack as the main program. Yu-cheng Yu (10): x86/cet: User-mode shadow stack support x86/cet: Introduce WRUSS instruction x86/cet: Signal handling for shadow stack x86/cet: Handle thread shadow stack x86/cet: ELF header parsing of Control Flow Enforcement x86/cet: Add arch_prctl functions for shadow stack mm: Prevent mprotect from changing shadow stack mm: Prevent mremap of shadow stack mm: Prevent madvise from changing shadow stack mm: Prevent munmap and remap_file_pages of shadow stack arch/x86/Kconfig | 4 + arch/x86/ia32/ia32_signal.c | 5 + arch/x86/include/asm/cet.h | 48 ++++++ arch/x86/include/asm/disabled-features.h | 8 +- arch/x86/include/asm/elf.h | 5 + arch/x86/include/asm/mmu_context.h | 3 + arch/x86/include/asm/msr-index.h | 14 ++ arch/x86/include/asm/processor.h | 5 + arch/x86/include/asm/special_insns.h | 44 +++++ arch/x86/include/uapi/asm/elf_property.h | 16 ++ arch/x86/include/uapi/asm/prctl.h | 15 ++ arch/x86/include/uapi/asm/sigcontext.h | 4 + arch/x86/kernel/Makefile | 4 + arch/x86/kernel/cet.c | 224 ++++++++++++++++++++++++ arch/x86/kernel/cet_prctl.c | 203 ++++++++++++++++++++++ arch/x86/kernel/cpu/common.c | 24 +++ arch/x86/kernel/elf.c | 236 ++++++++++++++++++++++++++ arch/x86/kernel/process.c | 10 ++ arch/x86/kernel/process_64.c | 7 + arch/x86/kernel/signal.c | 11 ++ arch/x86/lib/x86-opcode-map.txt | 2 +- arch/x86/mm/fault.c | 13 +- fs/binfmt_elf.c | 16 ++ fs/proc/task_mmu.c | 3 + include/uapi/linux/elf.h | 1 + mm/madvise.c | 9 + mm/mmap.c | 13 ++ mm/mprotect.c | 9 + mm/mremap.c | 5 +- tools/objtool/arch/x86/lib/x86-opcode-map.txt | 2 +- 30 files changed, 958 insertions(+), 5 deletions(-) create mode 100644 arch/x86/include/asm/cet.h create mode 100644 arch/x86/include/uapi/asm/elf_property.h create mode 100644 arch/x86/kernel/cet.c create mode 100644 arch/x86/kernel/cet_prctl.c create mode 100644 arch/x86/kernel/elf.c -- 2.15.1 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html