bpf: teach verifier actual bounds of bpf_get_smp_processor_id() result
bpf_get_smp_processor_id() helper returns current CPU on which BPF program runs. It can't return value that is bigger than maximum allowed number of CPUs (minus one, due to zero indexing). Teach BPF verifier to recognize that. This makes it possible to use bpf_get_smp_processor_id() result to index into arrays without extra checks, as demonstrated in subsequent selftests/bpf patch. Signed-off-by:Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/r/20230711232400.1658562-1-andrii@kernel.org Signed-off-by:
Alexei Starovoitov <ast@kernel.org>
parent
87e098e6
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