Daniel Borkmann 24c109bb15
bpf: Ensure off_reg has no mixed signed bounds for all types ...
The mixed signed bounds check really belongs into retrieve_ptr_limit()
instead of outside of it in adjust_ptr_min_max_vals(). The reason is
that this check is not tied to PTR_TO_MAP_VALUE only, but to all pointer
types that we handle in retrieve_ptr_limit() and given errors from the latter
propagate back to adjust_ptr_min_max_vals() and lead to rejection of the
program, it's a better place to reside to avoid anything slipping through
for future types. The reason why we must reject such off_reg is that we
otherwise would not be able to derive a mask, see details in 9d7eceede7daniel@iogearbox.net >
Reviewed-by: John Fastabend <john.fastabend@gmail.com >
Acked-by: Alexei Starovoitov <ast@kernel.org >
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