Martin KaFai Lau 7e3617a72d
bpf: Add array support to btf_struct_access ...
This patch adds array support to btf_struct_access().
It supports array of int, array of struct and multidimensional
array.
It also allows using u8[] as a scratch space. For example,
it allows access the "char cb[48]" with size larger than
the array's element "char". Another potential use case is
"u64 icsk_ca_priv[]" in the tcp congestion control.
btf_resolve_size() is added to resolve the size of any type.
It will follow the modifier if there is any. Please
see the function comment for details.
This patch also adds the "off < moff" check at the beginning
of the for loop. It is to reject cases when "off" is pointing
to a "hole" in a struct.
Signed-off-by: Martin KaFai Lau <kafai@fb.com >
Signed-off-by: Alexei Starovoitov <ast@kernel.org >
Link: https://lore.kernel.org/bpf/20191107180903.4097702-1-kafai@fb.com
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