bpf: add support for fixed-size memory pointer returns for kfuncs

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Support direct fixed-size (and for now, read-only) memory access when
kfunc's return type is a pointer to non-struct type. Calculate type size
and let BPF program access that many bytes directly. This is crucial for
numbers iterator.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20230302235015.2044271-13-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Andrii Nakryiko 2023-03-02 15:50:10 -08:00 • committed by Alexei Starovoitov

parent a461f5adf1

commit f4b4eee616

1 changed files with 8 additions and 0 deletions

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kernel/bpf/verifier.c

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