[SRU Bionic/Focal/Hirsute/OEM-5.10 0/4] LP: #1950239 - creat09 failing on XFS

[Thadeu Lima de Souza Cascardo]

BugLink: https://bugs.launchpad.net/bugs/1950239

[Impact]
setgid files may be created on setgid directories owned by the directory
group by users not belonging to that group. That is restricted to XFS.

[Fix/Backport]
The fix for 5.11 and 5.10 kernels is one simple commit with a minor
backport conflict fixup on 5.10.

5.4, on the other hand, required other 3 pre-requisites, which could be
picked cleanly. On 4.15, however, they needed a lot of mangling and fixes.

[Test case]
creat09 LTP test case.

[Potential regression]
The creation of files on XFS may have the wrong attributes. Also, on 5.4
and 4.15, the potential regression is larger, also affecting quota,
statistics and other interfaces where uid, gid and projid are exposed.

-- 
2.32.0