Comment 0 for bug 2028253

[Impact]

Provide an updated patch set for apparmor / LSM stacking with all the custom features that we need in the Ubuntu kernel.

[Fix]

Apply the latest updated patch set from:

 https://gitlab.com/jjohansen/apparmor-kernel

[Test case]

Run the apparmor test case suite.

[Regression potential]

This patch set introduces significant non-upstream changes to the security layer, so we may expect generic regressions in the kernel, especially running applications that are stressing the security layer (such as systemd, snapd, lxd, etc.).