CVE-2024-27050

In the Linux kernel, the following vulnerability has been resolved:

libbpf: Use OPTS_SET() macro in bpf_xdp_query()

When the feature_flags and xdp_zc_max_segs fields were added to the libbpf

bpf_xdp_query_opts, the code writing them did not use the OPTS_SET() macro.

This causes libbpf to write to those fields unconditionally, which means

that programs compiled against an older version of libbpf (with a smaller

size of the bpf_xdp_query_opts struct) will have its stack corrupted by

libbpf writing out of bounds.

The patch adding the feature_flags field has an early bail out if the

feature_flags field is not part of the opts struct (via the OPTS_HAS)

macro, but the patch adding xdp_zc_max_segs does not. For consistency, this

fix just changes the assignments to both fields to use the OPTS_SET()

macro.