CVE-2024-42142 Information

Description

In the Linux kernel the following vulnerability has been resolved:

net/mlx5: E-switch Create ingress ACL when needed

Currently ingress acl is used for three features. It is created only when vport metadata match and prio tag are enabled. But active-backup lag mode also uses it. It is independent of vport metadata match and prio tag. And vport metadata match can be disabled using the following devlink command:

devlink dev param set pci/0000:08:00.0 name esw_port_metadata
value false cmode runtime

If ingress acl is not created will hit panic when creating drop rule for active-backup lag mode. If always create it there will be about 5% performance degradation.

Fix it by creating ingress acl when needed. If esw_port_metadata is true ingress acl exists then create drop rule using existing ingress acl. If esw_port_metadata is false create ingress acl and then create drop rule.

Reference

https://git.kernel.org/stable/c/bc3ff8d3c05044de57865ebbb78cca8f7da3e595 https://git.kernel.org/stable/c/3e3551f8702978cd2221d2614ca6d6727e785324 https://git.kernel.org/stable/c/83bc1a129f7fd0d7d05036ceb7ee69102624e320 https://git.kernel.org/stable/c/b20c2fb45470d0c7a603613c9cfa5d45720e17f2