From 121ab822ef21914adac2fa3730efeeb8fd762473 Mon Sep 17 00:00:00 2001 From: Vivek Goyal Date: Wed, 13 Jul 2016 10:44:49 -0400 Subject: 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: David Howells Signed-off-by: Vivek Goyal Acked-by: Stephen Smalley [PM: whitespace cleanup for checkpatch.pl] Signed-off-by: Paul Moore --- fs/overlayfs/copy_up.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'fs/overlayfs') diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c index c297b1f..cd65f12 100644 --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -103,6 +103,13 @@ retry: goto retry; } + error = security_inode_copy_up_xattr(name); + if (error < 0 && error != -EOPNOTSUPP) + break; + if (error == 1) { + error = 0; + continue; /* Discard */ + } error = vfs_setxattr(new, name, value, size, 0); if (error) break; -- cgit v1.1