Merge branch 'more-gen_loader-fixes-2'

Daniel Borkmann says:

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More gen_loader fixes #2

Another small follow-up from the sashiko findings about signed loaders.
In particular, closing the gap to reject exclusive maps in iterators.
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Link: https://patch.msgid.link/20260602133052.423725-1-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>