Linux-api Archive on lore.kernel.org
 help / color / Atom feed
* [PATCH v25 00/12] Landlock LSM
@ 2020-12-01 19:23 Mickaël Salaün
  2020-12-01 19:23 ` [PATCH v25 01/12] landlock: Add object management Mickaël Salaün
                   ` (11 more replies)
  0 siblings, 12 replies; 13+ messages in thread
From: Mickaël Salaün @ 2020-12-01 19:23 UTC (permalink / raw)
  To: James Morris, Jann Horn, Serge E . Hallyn
  Cc: Mickaël Salaün, Al Viro, Andy Lutomirski, Anton Ivanov,
	Arnd Bergmann, Casey Schaufler, Jeff Dike, Jonathan Corbet,
	Kees Cook, Michael Kerrisk, Richard Weinberger, Shuah Khan,
	Vincent Dagonneau, kernel-hardening, linux-api, linux-arch,
	linux-doc, linux-fsdevel, linux-kernel, linux-kselftest,
	linux-security-module, x86

Hi,

This patch series mainly extend Landlock rules to store the whole access
rights stack.  This enables to tie access rights with their respective
layers to be able to have a sane semantic regardless of the previous
enforced rulesets.  This also enables to get back the union of access
rights when building a ruleset.  See layout1.interleaved_masked_accesses
tests from tools/testing/selftests/landlock/fs_test.c for corner cases.
Cf.
https://lore.kernel.org/lkml/CAG48ez2cmsrZbUEmQmzPQugJikkvfs_MWmMizxmoyspCeXAXRQ@mail.gmail.com/

The SLOC count is 1260 for security/landlock/ and 1711 for
tools/testing/selftest/landlock/ .  Test coverage for security/landlock/
is 94% of lines.  The code not covered only deals with internal kernel
errors (e.g. memory allocation) and race conditions.

The compiled documentation is available here:
https://landlock.io/linux-doc/landlock-v25/userspace-api/landlock.html

This series can be applied on top of v5.10-rc6 .  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-v25
I would really appreciate constructive comments on this patch series.


# 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/20201112205141.775752-1-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      |  280 +++
 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                     |   15 +
 samples/landlock/sandboxer.c                  |  236 +++
 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                        |  635 ++++++
 security/landlock/fs.h                        |   60 +
 security/landlock/object.c                    |   67 +
 security/landlock/object.h                    |   91 +
 security/landlock/ptrace.c                    |  120 ++
 security/landlock/ptrace.h                    |   14 +
 security/landlock/ruleset.c                   |  427 ++++
 security/landlock/ruleset.h                   |  163 ++
 security/landlock/setup.c                     |   40 +
 security/landlock/setup.h                     |   18 +
 security/landlock/syscall.c                   |  426 ++++
 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  |  117 ++
 tools/testing/selftests/landlock/common.h     |  113 ++
 tools/testing/selftests/landlock/config       |    5 +
 tools/testing/selftests/landlock/fs_test.c    | 1798 +++++++++++++++++
 .../testing/selftests/landlock/ptrace_test.c  |  307 +++
 tools/testing/selftests/landlock/true.c       |    5 +
 71 files changed, 5532 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/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/syscall.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: b65054597872ce3aefbc6a666385eabdf9e288da
-- 
2.29.2


^ permalink raw reply	[flat|nested] 13+ messages in thread

end of thread, back to index

Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-01 19:23 [PATCH v25 00/12] Landlock LSM Mickaël Salaün
2020-12-01 19:23 ` [PATCH v25 01/12] landlock: Add object management Mickaël Salaün
2020-12-01 19:23 ` [PATCH v25 02/12] landlock: Add ruleset and domain management Mickaël Salaün
2020-12-01 19:23 ` [PATCH v25 03/12] landlock: Set up the security framework and manage credentials Mickaël Salaün
2020-12-01 19:23 ` [PATCH v25 04/12] landlock: Add ptrace restrictions Mickaël Salaün
2020-12-01 19:23 ` [PATCH v25 05/12] LSM: Infrastructure management of the superblock Mickaël Salaün
2020-12-01 19:23 ` [PATCH v25 06/12] fs,security: Add sb_delete hook Mickaël Salaün
2020-12-01 19:23 ` [PATCH v25 07/12] landlock: Support filesystem access-control Mickaël Salaün
2020-12-01 19:23 ` [PATCH v25 08/12] landlock: Add syscall implementations Mickaël Salaün
2020-12-01 19:23 ` [PATCH v25 09/12] arch: Wire up Landlock syscalls Mickaël Salaün
2020-12-01 19:23 ` [PATCH v25 10/12] selftests/landlock: Add user space tests Mickaël Salaün
2020-12-01 19:23 ` [PATCH v25 11/12] samples/landlock: Add a sandbox manager example Mickaël Salaün
2020-12-01 19:23 ` [PATCH v25 12/12] landlock: Add user and kernel documentation Mickaël Salaün

Linux-api Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-api/0 linux-api/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-api linux-api/ https://lore.kernel.org/linux-api \
		linux-api@vger.kernel.org
	public-inbox-index linux-api

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-api


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git