> Fix it by changing sizeof(info) to
> offsetofend(struct bpf_prog_info, attach_btf_id).
>
> Fixes: b79c9fc9551b ("bpf: implement BPF_PROG_QUERY for BPF_LSM_CGROUP")
Is this the right commit for the Fixes: tag?
The change avoids the trailing padding that exists because struct
bpf_prog_info has 4 bytes of padding at its end, so sizeof(info) (232)
differs from offsetofend(struct bpf_prog_info, attach_btf_id) (228).
That trailing padding first appeared when __u32 verified_insns was
appended after the last __u64 member (recursion_misses). Before that,
the struct ended on an 8-byte-aligned member and had no trailing
padding.
b79c9fc9551b only appended two further __u32 fields (attach_btf_obj_id,
attach_btf_id), while the 4-byte trailing padding already existed and
was unchanged.
Would this be more accurate?
Fixes: aba64c7da983 ("bpf: Add verified_insns to bpf_prog_info and fdinfo")
---
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CI run summary: https://github.com/kernel-patches/bpf/actions/runs/26893539599
