selftests/bpf: Add tests for bpf_copy_from_user_str kfunc.

This adds tests for both the happy path and
the error path.

Signed-off-by: Jordan Rome <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>
4 files changed
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