From: Matteo Croce <mcroce@xxxxxxxxxxxxx> As formerly discussed on the BPF mailing list: https://lore.kernel.org/bpf/CAADnVQJDax2j0-7uyqdqFEnpB57om_z+Cqmi1O2QyLpHqkVKwA@xxxxxxxxxxxxxx/ changes from v2: test the bpf_core_type_exists() return value, and check that the recursion limit is enforced. Matteo Croce (2): bpf: limit bpf_core_types_are_compat() recursion selftests/bpf: test maximum recursion depth for bpf_core_types_are_compat() include/linux/btf.h | 5 + kernel/bpf/btf.c | 105 +++++++++++++++++- tools/testing/selftests/bpf/Makefile | 2 +- .../selftests/bpf/bpf_testmod/bpf_testmod.c | 5 + .../selftests/bpf/prog_tests/core_kern.c | 15 ++- .../bpf/prog_tests/core_kern_overflow.c | 13 +++ tools/testing/selftests/bpf/progs/core_kern.c | 14 +++ .../selftests/bpf/progs/core_kern_overflow.c | 21 ++++ 8 files changed, 177 insertions(+), 3 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/core_kern_overflow.c create mode 100644 tools/testing/selftests/bpf/progs/core_kern_overflow.c -- 2.34.1
