security,overlayfs: Provide security hook for copy up of xattrs for overlay file
Provide a security hook which is called when xattrs of a file are being copied up. This hook is called once for each xattr and LSM can return 0 if the security module wants the xattr to be copied up, 1 if the security module wants the xattr to be discarded on the copy, -EOPNOTSUPP if the security module does not handle/manage the xattr, or a -errno upon an error. Signed-off-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NVivek Goyal <vgoyal@redhat.com> Acked-by: NStephen Smalley <sds@tycho.nsa.gov> [PM: whitespace cleanup for checkpatch.pl] Signed-off-by: NPaul Moore <paul@paul-moore.com>
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