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Message-ID: <11a1adfd-d2e8-2181-81a-529792e4b6e5@namei.org>
Date: Wed, 28 Apr 2021 12:54:22 +1000 (AEST)
From: James Morris <jmorris@...ei.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
cc: linux-security-module@...r.kernel.org,
linux-kernel@...r.kernel.org,
Mickaël Salaün <mic@...ux.microsoft.com>,
Al Viro <viro@....linux.org.uk>
Subject: [GIT PULL][Security] Add new Landlock LSM
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 <mic@...ux.microsoft.com>
----------------------------------------------------------------
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
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