Extend the interoperability with IMA, to give wider flexibility for the implementation of integrity-focused LSMs based on eBPF.
Patch 1 fixes some style issues.
Patches 2-6 give the ability to eBPF-based LSMs to take advantage of the measurement capability of IMA without needing to setup a policy in IMA (those LSMs might implement the policy capability themselves).
Patches 7-9 allow eBPF-based LSMs to evaluate files read by the kernel.
Changelog
v2: - Add better description to patch 1 (suggested by Shuah) - Recalculate digest if it is not fresh (when IMA_COLLECTED flag not set) - Move declaration of bpf_ima_file_hash() at the end (suggested by Yonghong) - Add tests to check if the digest has been recalculated - Add deny test for bpf_kernel_read_file() - Add description to tests
v1: - Modify ima_file_hash() only and allow the usage of the function with the modified behavior by eBPF-based LSMs through the new function bpf_ima_file_hash() (suggested by Mimi) - Make bpf_lsm_kernel_read_file() sleepable so that bpf_ima_inode_hash() and bpf_ima_file_hash() can be called inside the implementation of eBPF-based LSMs for this hook
Roberto Sassu (9): ima: Fix documentation-related warnings in ima_main.c ima: Always return a file measurement in ima_file_hash() bpf-lsm: Introduce new helper bpf_ima_file_hash() selftests/bpf: Move sample generation code to ima_test_common() selftests/bpf: Add test for bpf_ima_file_hash() selftests/bpf: Check if the digest is refreshed after a file write bpf-lsm: Make bpf_lsm_kernel_read_file() as sleepable selftests/bpf: Add test for bpf_lsm_kernel_read_file() selftests/bpf: Check that bpf_kernel_read_file() denies reading IMA policy
include/uapi/linux/bpf.h | 11 ++ kernel/bpf/bpf_lsm.c | 21 +++ security/integrity/ima/ima_main.c | 57 ++++--- tools/include/uapi/linux/bpf.h | 11 ++ tools/testing/selftests/bpf/ima_setup.sh | 35 +++- .../selftests/bpf/prog_tests/test_ima.c | 149 +++++++++++++++++- tools/testing/selftests/bpf/progs/ima.c | 66 +++++++- 7 files changed, 321 insertions(+), 29 deletions(-)