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Commit 44f8fc64 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by Greg Kroah-Hartman
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bpf: restrict unknown scalars of mixed signed bounds for unprivileged



[ commit 9d7eceede769f90b66cfa06ad5b357140d5141ed upstream ]

For unknown scalars of mixed signed bounds, meaning their smin_value is
negative and their smax_value is positive, we need to reject arithmetic
with pointer to map value. For unprivileged the goal is to mask every
map pointer arithmetic and this cannot reliably be done when it is
unknown at verification time whether the scalar value is negative or
positive. Given this is a corner case, the likelihood of breaking should
be very small.

Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 5332dda9
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