selftests/bpf: Add tests for RCU lock transfer between subprogs

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Add selftests covering the following cases:
- A static or global subprog called from within a RCU read section works
- A static subprog taking an RCU read lock which is released in caller works
- A static subprog releasing the caller's RCU read lock works

Global subprogs that leave the lock in an imbalanced state will not
work, as they are verified separately, so ensure those cases fail as
well.

Acked-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20240205055646.1112186-3-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Kumar Kartikeya Dwivedi 2024-02-05 05:56:46 +00:00 • committed by Alexei Starovoitov

parent 6fceea0fa5

commit 8be6a0147a

2 changed files with 126 additions and 0 deletions

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6

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

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120

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

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