Daniel Borkmann b9b34ddbe2
bpf: Fix masking negation logic upon negative dst register ...
The negation logic for the case where the off_reg is sitting in the
dst register is not correct given then we cannot just invert the add
to a sub or vice versa. As a fix, perform the final bitwise and-op
unconditionally into AX from the off_reg, then move the pointer from
the src to dst and finally use AX as the source for the original
pointer arithmetic operation such that the inversion yields a correct
result. The single non-AX mov in between is possible given constant
blinding is retaining it as it's not an immediate based operation.
Fixes: 979d63d50cdaniel@iogearbox.net >
Tested-by: Piotr Krysiuk <piotras@gmail.com >
Reviewed-by: Piotr Krysiuk <piotras@gmail.com >
Reviewed-by: John Fastabend <john.fastabend@gmail.com >
Acked-by: Alexei Starovoitov <ast@kernel.org >
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b9b34ddbe2