selftests/bpf: Adding test for arg dereference in extension trace

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Adding test that setup following program:

  SEC("classifier/test_pkt_md_access")
  int test_pkt_md_access(struct __sk_buff *skb)

with its extension:

  SEC("freplace/test_pkt_md_access")
  int test_pkt_md_access_new(struct __sk_buff *skb)

and tracing that extension with:

  SEC("fentry/test_pkt_md_access_new")
  int BPF_PROG(fentry, struct sk_buff *skb)

The test verifies that the tracing program can
dereference skb argument properly.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/160138355603.48470.9072073357530773228.stgit@toke.dk

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This commit is contained in:

Jiri Olsa 2020-09-29 14:45:56 +02:00 • committed by Alexei Starovoitov

parent f6429476c2

commit 17d3f38675

3 changed files with 154 additions and 0 deletions

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111

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

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18

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

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25

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

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