bpf: Add type cast unit tests

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Three tests are added. One is from John Fastabend ({1]) which tests
tracing style access for xdp program from the kernel ctx.
Another is a tc test to test both kernel ctx tracing style access
and explicit non-ctx type cast. The third one is for negative tests
including two tests, a tp_bpf test where the bpf_rdonly_cast()
returns a untrusted ptr which cannot be used as helper argument,
and a tracepoint test where the kernel ctx is a u64.

Also added the test to DENYLIST.s390x since s390 does not currently
support calling kernel functions in JIT mode.

  [1] https://lore.kernel.org/bpf/20221109215242.1279993-1-john.fastabend@gmail.com/

Signed-off-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20221120195442.3114844-1-yhs@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Yonghong Song 2022-11-20 11:54:42 -08:00 • committed by Alexei Starovoitov

parent a35b9af4ec

commit 58d84bee58

3 changed files with 198 additions and 0 deletions

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1

tools/testing/selftests/bpf/DENYLIST.s390x

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114

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

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83

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

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