selftests/bpf: Test that exclusive maps are rejected in map-in-map

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Add a subtest to map_excl that verifies an exclusive map (created with
excl_prog_hash) cannot be used in a map-of-maps, covering both kernel
enforcement points: i) the inner-map template at map-of-maps creation
and, ii) the element inserted into an existing map-of-maps.

  # LDLIBS=-static PKG_CONFIG='pkg-config --static' ./vmtest.sh -- ./test_progs -t map_excl
  ./test_progs -t map_excl
  [    1.728106] bpf_testmod: loading out-of-tree module taints kernel.
  [    1.730473] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel
  #215/1   map_excl/map_excl_allowed:OK
  #215/2   map_excl/map_excl_denied:OK
  #215/3   map_excl/map_excl_no_map_in_map:OK
  #215     map_excl:OK
  Summary: 1/3 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20260601150248.394863-8-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

...

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Daniel Borkmann 2026-06-01 17:02:48 +02:00 • committed by Alexei Starovoitov

parent 38498c0eba

commit 32f725458a

1 changed files with 46 additions and 0 deletions

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tools/testing/selftests/bpf/prog_tests/map_excl.c

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