This was fixed by this commit:
UBUNTU: ubuntu: Yama: if an underlying filesystem provides a permissions op
When we are checking permissions on hardlinks we use generic_permissions()
to work out if the user actually has read/write permissions and only
then allow the link. However where the underlying filesystem supplies
a permissions() op there is no guarentee that the inode ownership is
actually valid and we must use that op instead.
Add a new function mirroring the core fragment from inode_permission
using the filesystem specific permissions() op falling back to
generic_permissions() when it is not present.
With this in place links in overlayfs behave as expected.
Signed-off-by: Andy Whitcroft <[email protected]>
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/663069
Title:
"non-accessable symlink" errors when using aufs-shaddowed read-only
root filesystem
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