Re: [PATCH net-next 2/3] bpf: change helper bpf_probe_read arg2 type to ARG_CONST_SIZE_OR_ZERO
From: Sergei Shtylyov <hidden>
Date: 2017-11-12 11:20:07
Hello! On 11/12/2017 3:00 AM, Yonghong Song wrote:
The helper bpf_probe_read arg2 type is changed from ARG_CONST_SIZE to ARG_CONST_SIZE_OR_ZERO to permit size-0 buffer. Together with newer ARG_CONST_SIZE_OR_ZERO semantics which allows non-NULL buffer with size 0, this allows simpler bpf programs with verifier acceptance. The prvious commit which changes ARG_CONST_SIZE_OR_ZERO semantics
Previous.
has details on examples. Signed-off-by: Yonghong Song <redacted> Acked-by: Alexei Starovoitov <ast@kernel.org>
[...] MBR, Sergei