Patchset implements new type of Landlock rule, that restricts actions for
sockets of any protocol. Such restriction would be useful to ensure
that a sandboxed process uses only necessary protocols.
See [2] for more cases.
The rules store information about the socket family(aka domain) and type.
struct landlock_socket_attr {
__u64 allowed_access;
int domain; // see socket(2)
int type; // see socket(2)
}
Patchset currently implements rule only for socket_create() method, but
other necessary rules will also be impemented. [1]
Code coverage(gcov) report with the launch of all the landlock selftests:
* security/landlock:
lines......: 94.7% (784 of 828 lines)
functions..: 97.2% (105 of 108 functions)
* security/landlock/socket.c:
lines......: 100.0% (33 of 33 lines)
functions..: 100.0% (5 of 5 functions)
[1] https://lore.kernel.org/all/b8a2045a-e7e8-d141-7c01-bf47874c7930@xxxxxxxxxxx/
[2] https://lore.kernel.org/all/ZJvy2SViorgc+cZI@xxxxxxxxxx/
Ivanov Mikhail (10):
landlock: Support socket access-control
landlock: Add hook on socket_create()
selftests/landlock: Create 'create' test
selftests/landlock: Create 'socket_access_rights' test
selftests/landlock: Create 'rule_with_unknown_access' test
selftests/landlock: Create 'rule_with_unhandled_access' test
selftests/landlock: Create 'inval' test
selftests/landlock: Create 'ruleset_overlap' test
selftests/landlock: Create 'ruleset_with_unknown_access' test
samples/landlock: Support socket protocol restrictions
include/uapi/linux/landlock.h | 49 ++
samples/landlock/sandboxer.c | 149 +++++-
security/landlock/Makefile | 2 +-
security/landlock/limits.h | 5 +
security/landlock/net.c | 2 +-
security/landlock/ruleset.c | 35 +-
security/landlock/ruleset.h | 44 +-
security/landlock/setup.c | 2 +
security/landlock/socket.c | 115 +++++
security/landlock/socket.h | 19 +
security/landlock/syscalls.c | 55 ++-
tools/testing/selftests/landlock/base_test.c | 2 +-
.../testing/selftests/landlock/socket_test.c | 457 ++++++++++++++++++
13 files changed, 910 insertions(+), 26 deletions(-)
create mode 100644 security/landlock/socket.c
create mode 100644 security/landlock/socket.h
create mode 100644 tools/testing/selftests/landlock/socket_test.c
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2.34.1
