selftests/bpf: Add local kptr stashing test

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Add a new selftest, local_kptr_stash, which uses bpf_kptr_xchg to stash
a bpf_obj_new-allocated object in a map. Test the following scenarios:

  * Stash two rb_nodes in an arraymap, don't unstash them, rely on map
    free to destruct them
  * Stash two rb_nodes in an arraymap, unstash the second one in a
    separate program, rely on map free to destruct first

Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com>
Link: https://lore.kernel.org/r/20230310230743.2320707-4-davemarchevsky@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Dave Marchevsky 2023-03-10 15:07:43 -08:00 • committed by Alexei Starovoitov

parent 738c96d5e2

commit 5d8d6634cc

2 changed files with 168 additions and 0 deletions

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60

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

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108

tools/testing/selftests/bpf/progs/local_kptr_stash.c

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