In the steps from comment #3, after the chown ls shows the file in both
the upperdir and the mount as owned by $USER:$USER. However the inode
from the overlayfs superblock which ovl_setattr() passes to
inode_change_ok() seems to still be owned by root. This seems to be
because ovl_getattr() gets the attributes from the inode in the
upper/lower fs and not from the overlayfs inode.
Actually, I don't think the attributes were ever being copied to the
overlayfs inode. "ovl: setattr: check permissions before copy-up" adds a
call to inode_change_ok() on the overlayfs inode at the beginning of
ovl_setattr(). Before that it only ever checked that the change was okay
for the inode in upperdir, so the fact that the attributes weren't
copied over didn't cause a failure.
That's a commit we got from upstream stable, and sure enough the bug
exists in 4.5-rc7 as well.
** Changed in: linux (Ubuntu Xenial)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu Xenial)
Assignee: (unassigned) => Seth Forshee (sforshee)
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https://bugs.launchpad.net/bugs/1555997
Title:
overlay fs regression: chmod fails with "Operation not permitted" on
chowned files
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