From patchwork Wed Apr 28 02:54:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: James Morris X-Patchwork-Id: 12227897 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=-18.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,INCLUDES_PULL_REQUEST, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS 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 5EE1EC433B4 for ; Wed, 28 Apr 2021 02:58:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 308F4613D8 for ; Wed, 28 Apr 2021 02:58:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237124AbhD1C7L (ORCPT ); Tue, 27 Apr 2021 22:59:11 -0400 Received: from namei.org ([65.99.196.166]:54052 "EHLO mail.namei.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235839AbhD1C7L (ORCPT ); Tue, 27 Apr 2021 22:59:11 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.namei.org (Postfix) with ESMTPS id 94D85A1D; Wed, 28 Apr 2021 02:54:22 +0000 (UTC) Date: Wed, 28 Apr 2021 12:54:22 +1000 (AEST) From: James Morris To: Linus Torvalds cc: linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, =?iso-8859-15?q?Micka=EBl_Sala=FCn?= , Al Viro Subject: [GIT PULL][Security] Add new Landlock LSM Message-ID: <11a1adfd-d2e8-2181-81a-529792e4b6e5@namei.org> MIME-Version: 1.0 Content-ID: Precedence: bulk List-ID: Hi Linus, This patchset adds a new LSM called Landlock, from Mickaël Salaün. Briefly, Landlock provides for unprivileged application sandboxing. From Mickaël's cover letter: The goal of Landlock is to enable to restrict ambient rights (e.g. global filesystem access) for a set of processes. Because Landlock is a stackable LSM [1], it makes possible to create safe security sandboxes as new security layers in addition to the existing system-wide access-controls. This kind of sandbox is expected to help mitigate the security impact of bugs or unexpected/malicious behaviors in user-space applications. Landlock empowers any process, including unprivileged ones, to securely restrict themselves. Landlock is inspired by seccomp-bpf but instead of filtering syscalls and their raw arguments, a Landlock rule can restrict the use of kernel objects like file hierarchies, according to the kernel semantic. Landlock also takes inspiration from other OS sandbox mechanisms: XNU Sandbox, FreeBSD Capsicum or OpenBSD Pledge/Unveil. In this current form, Landlock misses some access-control features. This enables to minimize this patch series and ease review. This series still addresses multiple use cases, especially with the combined use of seccomp-bpf: applications with built-in sandboxing, init systems, security sandbox tools and security-oriented APIs [2]. [1] https://lore.kernel.org/lkml/50db058a-7dde-441b-a7f9-f6837fe8b69f@schaufler-ca.com/ [2] https://lore.kernel.org/lkml/f646e1c7-33cf-333f-070c-0a40ad0468cd@digikod.net/ The cover letter and v34 posting is here: https://lore.kernel.org/linux-security-module/20210422154123.13086-1-mic@digikod.net/ See also: https://landlock.io/ This code has had extensive design discussion and review over several years. The v33 code has been in next since April 9, and was updated last week to v34 with a relatively simple change. If you prefer to pull v33 instead, please pull "tags/landlock_v33" instead, and we'll push the change through after merging. There's a merge conflict in the syscall tables, with resolution by Stephen Rothwell: https://lore.kernel.org/linux-next/20210409143954.22329cfa@canb.auug.org.au/ Al Viro raised some issues re. the VFS in v31: https://lore.kernel.org/linux-security-module/YGUslUPwp85Zrp4t@zeniv-ca.linux.org.uk/ which were addressed in comments and in v33: https://lore.kernel.org/linux-security-module/5f4dfa1-f9ac-f31f-3237-dcf976cabbfc@namei.org/ Please pull. --- The following changes since commit 1e28eed17697bcf343c6743f0028cc3b5dd88bf0: Linux 5.12-rc3 (2021-03-14 14:41:02 -0700) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security.git tags/landlock_v34 for you to fetch changes up to 3532b0b4352ce79400b0aa68414f1a0fc422b920: landlock: Enable user space to infer supported features (2021-04-22 12:22:11 -0700) ---------------------------------------------------------------- Add Landlock, a new LSM from Mickaël Salaün ---------------------------------------------------------------- Casey Schaufler (1): LSM: Infrastructure management of the superblock Mickaël Salaün (12): landlock: Add object management landlock: Add ruleset and domain management landlock: Set up the security framework and manage credentials landlock: Add ptrace restrictions landlock: Support filesystem access-control fs,security: Add sb_delete hook arch: Wire up Landlock syscalls landlock: Add syscall implementations selftests/landlock: Add user space tests samples/landlock: Add a sandbox manager example landlock: Add user and kernel documentation landlock: Enable user space to infer supported features Documentation/security/index.rst | 1 + Documentation/security/landlock.rst | 85 + Documentation/userspace-api/index.rst | 1 + Documentation/userspace-api/landlock.rst | 311 +++ MAINTAINERS | 15 + arch/Kconfig | 7 + arch/alpha/kernel/syscalls/syscall.tbl | 3 + arch/arm/tools/syscall.tbl | 3 + arch/arm64/include/asm/unistd.h | 2 +- arch/arm64/include/asm/unistd32.h | 6 + arch/ia64/kernel/syscalls/syscall.tbl | 3 + arch/m68k/kernel/syscalls/syscall.tbl | 3 + arch/microblaze/kernel/syscalls/syscall.tbl | 3 + arch/mips/kernel/syscalls/syscall_n32.tbl | 3 + arch/mips/kernel/syscalls/syscall_n64.tbl | 3 + arch/mips/kernel/syscalls/syscall_o32.tbl | 3 + arch/parisc/kernel/syscalls/syscall.tbl | 3 + arch/powerpc/kernel/syscalls/syscall.tbl | 3 + arch/s390/kernel/syscalls/syscall.tbl | 3 + arch/sh/kernel/syscalls/syscall.tbl | 3 + arch/sparc/kernel/syscalls/syscall.tbl | 3 + arch/um/Kconfig | 1 + arch/x86/entry/syscalls/syscall_32.tbl | 3 + arch/x86/entry/syscalls/syscall_64.tbl | 3 + arch/xtensa/kernel/syscalls/syscall.tbl | 3 + fs/super.c | 1 + include/linux/lsm_hook_defs.h | 1 + include/linux/lsm_hooks.h | 4 + include/linux/security.h | 4 + include/linux/syscalls.h | 7 + include/uapi/asm-generic/unistd.h | 8 +- include/uapi/linux/landlock.h | 137 ++ kernel/sys_ni.c | 5 + samples/Kconfig | 7 + samples/Makefile | 1 + samples/landlock/.gitignore | 1 + samples/landlock/Makefile | 13 + samples/landlock/sandboxer.c | 238 ++ security/Kconfig | 11 +- security/Makefile | 2 + security/landlock/Kconfig | 21 + security/landlock/Makefile | 4 + security/landlock/common.h | 20 + security/landlock/cred.c | 46 + security/landlock/cred.h | 58 + security/landlock/fs.c | 692 ++++++ security/landlock/fs.h | 70 + security/landlock/limits.h | 21 + security/landlock/object.c | 67 + security/landlock/object.h | 91 + security/landlock/ptrace.c | 120 + security/landlock/ptrace.h | 14 + security/landlock/ruleset.c | 473 ++++ security/landlock/ruleset.h | 165 ++ security/landlock/setup.c | 40 + security/landlock/setup.h | 18 + security/landlock/syscalls.c | 451 ++++ security/security.c | 51 +- security/selinux/hooks.c | 58 +- security/selinux/include/objsec.h | 6 + security/selinux/ss/services.c | 3 +- security/smack/smack.h | 6 + security/smack/smack_lsm.c | 35 +- tools/testing/selftests/Makefile | 1 + tools/testing/selftests/landlock/.gitignore | 2 + tools/testing/selftests/landlock/Makefile | 24 + tools/testing/selftests/landlock/base_test.c | 266 +++ tools/testing/selftests/landlock/common.h | 183 ++ tools/testing/selftests/landlock/config | 7 + tools/testing/selftests/landlock/fs_test.c | 2791 ++++++++++++++++++++++++ tools/testing/selftests/landlock/ptrace_test.c | 337 +++ tools/testing/selftests/landlock/true.c | 5 + 72 files changed, 6986 insertions(+), 77 deletions(-) create mode 100644 Documentation/security/landlock.rst create mode 100644 Documentation/userspace-api/landlock.rst create mode 100644 include/uapi/linux/landlock.h create mode 100644 samples/landlock/.gitignore create mode 100644 samples/landlock/Makefile create mode 100644 samples/landlock/sandboxer.c create mode 100644 security/landlock/Kconfig create mode 100644 security/landlock/Makefile create mode 100644 security/landlock/common.h create mode 100644 security/landlock/cred.c create mode 100644 security/landlock/cred.h create mode 100644 security/landlock/fs.c create mode 100644 security/landlock/fs.h create mode 100644 security/landlock/limits.h create mode 100644 security/landlock/object.c create mode 100644 security/landlock/object.h create mode 100644 security/landlock/ptrace.c create mode 100644 security/landlock/ptrace.h create mode 100644 security/landlock/ruleset.c create mode 100644 security/landlock/ruleset.h create mode 100644 security/landlock/setup.c create mode 100644 security/landlock/setup.h create mode 100644 security/landlock/syscalls.c create mode 100644 tools/testing/selftests/landlock/.gitignore create mode 100644 tools/testing/selftests/landlock/Makefile create mode 100644 tools/testing/selftests/landlock/base_test.c create mode 100644 tools/testing/selftests/landlock/common.h create mode 100644 tools/testing/selftests/landlock/config create mode 100644 tools/testing/selftests/landlock/fs_test.c create mode 100644 tools/testing/selftests/landlock/ptrace_test.c create mode 100644 tools/testing/selftests/landlock/true.c