[PATCH] Default hooks protecting the XATTR_SECURITY_PREFIX namespace

[PATCH] Default hooks protecting the XATTR_SECURITY_PREFIX namespace

From: Chris Wright <chrisw@osdl.org>

Add default hooks for both the dummy and capability code to protect the
XATTR_SECURITY_PREFIX namespace.  These EAs were fully accessible to
unauthorized users, so a user that rebooted from an SELinux kernel to a
default kernel would leave those critical EAs unprotected.

(Acked by Stephen Smalley)