USN-6425-2: Samba regression

USN-6425-1 fixed vulnerabilities in Samba. Due to a build issue on Ubuntu
20.04 LTS, the update introduced regressions in macro handling and
possibly other functionality.

This update fixes the problem. We apologize for the inconvenience.

Original advisory details:

Sri Nagasubramanian discovered that the Samba acl_xattr VFS module
incorrectly handled read-only files. When Samba is configured to ignore
system ACLs, a remote attacker could possibly use this issue to truncate
read-only files. (CVE-2023-4091)

Andrew Bartlett discovered that Samba incorrectly handled the …

advisory build files fixes handling issue lts macro problem samba ubuntu update usn vulnerabilities