bpf: Allow instructions with arena source and non-arena dest registers

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The compiler sometimes stores the result of a PTR_TO_ARENA and SCALAR
operation into the scalar register rather than the pointer register.
Relax the verifier to allow operations between a source arena register
and a destination non-arena register, marking the destination's value
as a PTR_TO_ARENA.

Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Acked-by: Song Liu <song@kernel.org>
Fixes: 6082b6c328 ("bpf: Recognize addr_space_cast instruction in the verifier.")
Link: https://lore.kernel.org/r/20260412174546.18684-2-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Emil Tsalapatis 2026-04-12 13:45:38 -04:00 • committed by Alexei Starovoitov

parent 9623c3c69e

commit ac61bffe91

1 changed files with 11 additions and 3 deletions

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kernel/bpf/verifier.c

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