selftests/bpf: test for changing packet data from global functions

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Check if verifier is aware of packet pointers invalidation done in
global functions. Based on a test shared by Nick Zavaritsky in [0].

[0] https://lore.kernel.org/bpf/0498CA22-5779-4767-9C0C-A9515CEA711F@gmail.com/

Suggested-by: Nick Zavaritsky <mejedi@gmail.com>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20241210041100.1898468-5-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Eduard Zingerman 2024-12-09 20:10:56 -08:00 • committed by Alexei Starovoitov

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commit 3f23ee5590

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

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