Vulnerability CVE-2024-27050
Published: 2024-05-01

Description:
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.

 References:
https://git.kernel.org/stable/c/fa5bef5e80c6a3321b2b1a7070436f3bc5daf07c
https://git.kernel.org/stable/c/682ddd62abd4bdcee7584246903e7a2df005fe0d
https://git.kernel.org/stable/c/cd3be9843247edb8fc6fcd8d8237cbce2bc19f5e
https://git.kernel.org/stable/c/92a871ab9fa59a74d013bc04f321026a057618e7
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