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Message-Id: <20210121205119.793296-1-mic@digikod.net>
Date: Thu, 21 Jan 2021 21:51:07 +0100
From: Mickaël Salaün <mic@...ikod.net>
To: James Morris <jmorris@...ei.org>, Jann Horn <jannh@...gle.com>,
"Serge E . Hallyn" <serge@...lyn.com>
Cc: Mickaël Salaün <mic@...ikod.net>,
Al Viro <viro@...iv.linux.org.uk>,
Andy Lutomirski <luto@...capital.net>,
Anton Ivanov <anton.ivanov@...bridgegreys.com>,
Arnd Bergmann <arnd@...db.de>,
Casey Schaufler <casey@...aufler-ca.com>,
Jeff Dike <jdike@...toit.com>,
Jonathan Corbet <corbet@....net>,
Kees Cook <keescook@...omium.org>,
Michael Kerrisk <mtk.manpages@...il.com>,
Richard Weinberger <richard@....at>,
Shuah Khan <shuah@...nel.org>,
Vincent Dagonneau <vincent.dagonneau@....gouv.fr>,
kernel-hardening@...ts.openwall.com, linux-api@...r.kernel.org,
linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org,
linux-security-module@...r.kernel.org, x86@...nel.org
Subject: [PATCH v27 00/12] Landlock LSM
Hi,
This patch series adjusts the semantic of file hierarchy access-control
per layer to get a more pragmatic and compatible approach. I updated
the documentation to explain how layers, bind mounts and overlayfs are
handled by Landlock. A syscall is also renamed to make it less
ambiguous for future evolution. Last but not least, the test file
layout cleanups are more resilient, and a lot of tests are added to
cover bind mounts and overlayfs, which are fully supported.
The SLOC count is 1292 for security/landlock/ and 2425 for
tools/testing/selftest/landlock/ . Test coverage for security/landlock/
is 94.7% of lines. The code not covered only deals with internal kernel
errors (e.g. memory allocation) and race conditions. This series is
being fuzzed by syzkaller, and patches are on their way:
https://github.com/google/syzkaller/pull/2380
The compiled documentation is available here:
https://landlock.io/linux-doc/landlock-v27/userspace-api/landlock.html
This series can be applied on top of v5.11-rc4 . This can be tested
with CONFIG_SECURITY_LANDLOCK, CONFIG_SAMPLE_LANDLOCK and by prepending
"landlock," to CONFIG_LSM. This patch series can be found in a Git
repository here:
https://github.com/landlock-lsm/linux/commits/landlock-v27
This patch series seems ready for upstream and I would really appreciate
final reviews.
# Landlock LSM
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].
Previous version:
https://lore.kernel.org/lkml/20201209192839.1396820-1-mic@digikod.net/
[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/
Casey Schaufler (1):
LSM: Infrastructure management of the superblock
Mickaël Salaün (11):
landlock: Add object management
landlock: Add ruleset and domain management
landlock: Set up the security framework and manage credentials
landlock: Add ptrace restrictions
fs,security: Add sb_delete hook
landlock: Support filesystem access-control
landlock: Add syscall implementations
arch: Wire up Landlock syscalls
selftests/landlock: Add user space tests
samples/landlock: Add a sandbox manager example
landlock: Add user and kernel documentation
Documentation/security/index.rst | 1 +
Documentation/security/landlock.rst | 79 +
Documentation/userspace-api/index.rst | 1 +
Documentation/userspace-api/landlock.rst | 306 ++
MAINTAINERS | 13 +
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 | 3 +
include/linux/security.h | 4 +
include/linux/syscalls.h | 7 +
include/uapi/asm-generic/unistd.h | 8 +-
include/uapi/linux/landlock.h | 128 +
kernel/sys_ni.c | 5 +
samples/Kconfig | 7 +
samples/Makefile | 1 +
samples/landlock/.gitignore | 1 +
samples/landlock/Makefile | 13 +
samples/landlock/sandboxer.c | 239 ++
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 | 621 ++++
security/landlock/fs.h | 56 +
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 | 466 +++
security/landlock/ruleset.h | 161 +
security/landlock/setup.c | 40 +
security/landlock/setup.h | 18 +
security/landlock/syscalls.c | 429 +++
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 | 219 ++
tools/testing/selftests/landlock/common.h | 166 ++
tools/testing/selftests/landlock/config | 6 +
tools/testing/selftests/landlock/fs_test.c | 2585 +++++++++++++++++
.../testing/selftests/landlock/ptrace_test.c | 314 ++
tools/testing/selftests/landlock/true.c | 5 +
72 files changed, 6552 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
base-commit: 19c329f6808995b142b3966301f217c831e7cf31
--
2.30.0
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