selftests/bpf: Add tests for FIONREAD and copied_seq

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This commit adds two new test functions: one to reproduce the bug reported
by syzkaller [1], and another to cover the calculation of copied_seq.

The tests primarily involve installing  and uninstalling sockmap on
sockets, then reading data to verify proper functionality.

Additionally, extend the do_test_sockmap_skb_verdict_fionread() function
to support UDP FIONREAD testing.

[1] https://syzkaller.appspot.com/bug?extid=06dbd397158ec0ea4983

Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/r/20260124113314.113584-4-jiayuan.chen@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Jiayuan Chen 2026-01-24 19:32:45 +08:00 • committed by Alexei Starovoitov

parent 929e30f931

commit 17e2ce02bf

2 changed files with 302 additions and 6 deletions

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294

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

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14

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

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