bpf: reject non-exact register type matches in regsafe()

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Generalize the (somewhat implicit) rule of regsafe(), which states that
if register types in old and current states do not match *exactly*, they
can't be safely considered equivalent.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20221223054921.958283-5-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Andrii Nakryiko 2022-12-22 21:49:18 -08:00 • committed by Alexei Starovoitov

parent 7f4ce97cd5

commit 910f699966

1 changed files with 21 additions and 24 deletions

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kernel/bpf/verifier.c

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