bpf: Only reply field should be writeable

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Currently, a sock_ops BPF program can write the op field and all the
reply fields (reply and replylong). This is a bug. The op field should
not have been writeable and there is currently no way to use replylong
field for indices >= 1. This patch enforces that only the reply field
(which equals replylong[0]) is writeable.

Fixes: 40304b2a15 ("bpf: BPF support for sock_ops")
Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Lawrence Brakmo 2018-01-25 16:14:05 -08:00 • committed by Alexei Starovoitov

parent e9dcd80b9d

commit 2585cd62f0

1 changed files with 1 additions and 2 deletions

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net/core/filter.c

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