Re: [PATCH bpf-next v3 2/6] bpf/libbpf: BTF support for typed ksyms
From: Andrii Nakryiko <hidden>
Date: 2020-09-21 17:52:55
Also in:
bpf, linux-kselftest, lkml
On Wed, Sep 16, 2020 at 3:38 PM Hao Luo [off-list ref] wrote:
If a ksym is defined with a type, libbpf will try to find the ksym's btf information from kernel btf. If a valid btf entry for the ksym is found, libbpf can pass in the found btf id to the verifier, which validates the ksym's type and value. Typeless ksyms (i.e. those defined as 'void') will not have such btf_id, but it has the symbol's address (read from kallsyms) and its value is treated as a raw pointer. Signed-off-by: Hao Luo <redacted> ---
This looks nice and clean, thanks! Acked-by: Andrii Nakryiko <redacted>
tools/lib/bpf/libbpf.c | 112 ++++++++++++++++++++++++++++++++++++----- 1 file changed, 99 insertions(+), 13 deletions(-)
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