From: Alexei Starovoitov [mailto:alexei.starovoitov@gmail.com] Sent: Wednesday, March 2, 2022 11:21 PM On Wed, Mar 02, 2022 at 12:13:55PM +0100, Roberto Sassu wrote:
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
We have to land this set through bpf-next. Please get the Acks for patches 1 and 2, so we can proceed.
Ok. Mimi, do you have time to have a look at those patches?
Thanks
Roberto
HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063 Managing Director: Li Peng, Zhong Ronghua