selftests/bpf: Add untrusted BTF write regression

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Add a TCP congestion-control struct_ops load test for a write through a
BTF pointer produced by bpf_rdonly_cast().

The test expects the verifier to reject the program before the TCP CA
btf_struct_access callback can whitelist the tcp_sock field write.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Reviewed-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>

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Kumar Kartikeya Dwivedi 2026-07-08 05:07:51 +02:00 • committed by Eduard Zingerman

parent ac65c710cc

commit 9eab4790f1

2 changed files with 38 additions and 0 deletions

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12

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

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26

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

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