selftests/bpf: Make sure optvals > PAGE_SIZE are bypassed

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We are relying on the fact, that we can pass > sizeof(int) optvals
to the SOL_IP+IP_FREEBIND option (the kernel will take first 4 bytes).
In the BPF program we check that we can only touch PAGE_SIZE bytes,
but the real optlen is PAGE_SIZE * 2. In both cases, we override it to
some predefined value and trim the optlen.

Also, let's modify exiting IP_TOS usecase to test optlen=0 case
where BPF program just bypasses the data as is.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200617010416.93086-2-sdf@google.com

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Stanislav Fomichev 2020-06-16 18:04:15 -07:00 • committed by Alexei Starovoitov

parent d8fe449a9c

commit a0cb12b031

2 changed files with 91 additions and 9 deletions

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46

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

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54

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

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