[PATCH bpf-next v3 0/2] limit bpf_core_types_are_compat recursion

[Matteo Croce]

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

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2.34.1