From: Xu Kuohai <xukuohai@xxxxxxxxxx> LSM BPF prog may make kernel panic when returning an unexpected value, such as returning positive value on hook file_alloc_security. To fix it, series [1] refactored LSM hook return values and added BPF return value check on top of that. Since the refactoring of LSM hooks and checking BPF prog return value patches is not closely related, this series separates BPF-related patches from [1]. Changes to [1]: 1. Extend LSM disabled list to include hooks refactored in [1] to avoid dependency on the hooks return value refactoring patches. 2. Replace the special case patch for bitwise AND on [-1, 0] with Shung-Hsi's general bitwise AND improvement patch [2]. 3. Remove unused patches. [1] https://lore.kernel.org/bpf/20240711111908.3817636-1-xukuohai@xxxxxxxxxxxxxxx https://lore.kernel.org/bpf/20240711113828.3818398-1-xukuohai@xxxxxxxxxxxxxxx [2] https://lore.kernel.org/bpf/ykuhustu7vt2ilwhl32kj655xfdgdlm2xkl5rff6tw2ycksovp@ss2n4gpjysnw Shung-Hsi Yu (1): bpf, verifier: improve signed ranges inference for BPF_AND Xu Kuohai (8): bpf, lsm: Add disabled BPF LSM hook list bpf, lsm: Add check for BPF LSM return value bpf: Prevent tail call between progs attached to different hooks bpf: Fix compare error in function retval_range_within selftests/bpf: Avoid load failure for token_lsm.c selftests/bpf: Add return value checks for failed tests selftests/bpf: Add test for lsm tail call selftests/bpf: Add verifier tests for bpf lsm include/linux/bpf.h | 2 + include/linux/bpf_lsm.h | 8 + kernel/bpf/bpf_lsm.c | 65 ++++++- kernel/bpf/btf.c | 5 +- kernel/bpf/core.c | 21 ++- kernel/bpf/verifier.c | 138 ++++++++++---- .../selftests/bpf/prog_tests/test_lsm.c | 46 ++++- .../selftests/bpf/prog_tests/verifier.c | 2 + tools/testing/selftests/bpf/progs/err.h | 10 + .../selftests/bpf/progs/lsm_tailcall.c | 34 ++++ .../selftests/bpf/progs/test_sig_in_xattr.c | 4 + .../bpf/progs/test_verify_pkcs7_sig.c | 8 +- tools/testing/selftests/bpf/progs/token_lsm.c | 4 +- .../bpf/progs/verifier_global_subprogs.c | 7 +- .../selftests/bpf/progs/verifier_lsm.c | 178 ++++++++++++++++++ 15 files changed, 485 insertions(+), 47 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/lsm_tailcall.c create mode 100644 tools/testing/selftests/bpf/progs/verifier_lsm.c -- 2.30.2
