CVE-2024-27050

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> libbpf: Use OPTS_SET() macro in bpf_xdp_query()<br /> <br /> When the feature_flags and xdp_zc_max_segs fields were added to the libbpf<br /> bpf_xdp_query_opts, the code writing them did not use the OPTS_SET() macro.<br /> This causes libbpf to write to those fields unconditionally, which means<br /> that programs compiled against an older version of libbpf (with a smaller<br /> size of the bpf_xdp_query_opts struct) will have its stack corrupted by<br /> libbpf writing out of bounds.<br /> <br /> The patch adding the feature_flags field has an early bail out if the<br /> feature_flags field is not part of the opts struct (via the OPTS_HAS)<br /> macro, but the patch adding xdp_zc_max_segs does not. For consistency, this<br /> fix just changes the assignments to both fields to use the OPTS_SET()<br /> macro.