ACK: [SRU][K/L/Unstable][PATCH 0/1] UBUNTU: SAUCE: overlayfs: handle idmapped mounts in ovl_do_(set|remove)xattr (LP: 2009065)

[Luke Nowakowski-Krijger]

Acked-by: Luke Nowakowski-Krijger <luke.nowakowskikrijger at canonical.com>

On Thu, Mar 2, 2023 at 1:24 PM Alexander Mikhalitsyn <
aleksandr.mikhalitsyn at canonical.com> wrote:

> BugLink: http://bugs.launchpad.net/bugs/2009065
>
> SRU Justification:
>
> [Impact]
>
> Unprivileged LXC containers users with idmapped root (Ubuntu kernels >=
> 5.19) getting
> all overlayfs mounts inside mounted as R/O.
>
> Impacted Ubuntu versions J/K/L. Jammy is affected only with hwe-5.19.
>
> [Fix]
>
> 813fa2cd9e259dacd8f9086226287dc167c8c0c5 "UBUNTU: SAUCE: overlayfs: handle
> idmapped mounts in
>  ovl_do_(set|remove)xattr"
>
> [Test Plan]
>
> Reproducer:
> $ cd /idmapped/mount/path
> $ mkdir {work,upper,lower,ovl}
> $ mount -t overlay overlay -o lowerdir=lower,upperdir=upper,workdir=work
> ovl
> $ touch ovl/test
> touch: cannot touch 'ovl/test': Read-only file system
>
> [Where problems could occur]
>
> The regression can be considered as low, because we just making things to
> work the same way as in upstream.
>
> [Other Info]
>
> We need to apply this patch to Jammy/hwe-5.19 tree too. The same patch can
> be applied to kinetic/master, lunar/master, unstable (6.2) tree.
>
> Alexander Mikhalitsyn (1):
>   UBUNTU: SAUCE: overlayfs: handle idmapped mounts in
>     ovl_do_(set|remove)xattr
>
>  fs/overlayfs/overlayfs.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> --
> 2.34.1
>
>
> --
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/kernel-team/attachments/20230306/7d5d86ad/attachment.html>