selftests/bpf: Add test for freplace program with write access

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This adds a selftest that tests the behavior when a freplace target program
attempts to make a write access on a packet. The expectation is that the read or write
access is granted based on the program type of the linked program and
not itself (which is of type, for e.g., BPF_PROG_TYPE_EXT).

This test fails without the associated patch on the verifier.

Signed-off-by: Udip Pant <udippant@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200825232003.2877030-3-udippant@fb.com

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Udip Pant 2020-08-25 16:20:01 -07:00 • committed by Alexei Starovoitov

parent 7e40781cc8

commit 6dc03dc713

3 changed files with 48 additions and 0 deletions

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1

tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c

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tools/testing/selftests/bpf/progs/fexit_bpf2bpf.c

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

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