security: remove security_sb_post_mountroot hook

The security_sb_post_mountroot() hook is long-since obsolete, and is
fundamentally broken: it is never invoked if someone uses initramfs.
This is particularly damaging, because the existence of this hook has
been used as motivation for not using initramfs.

Stephen Smalley confirmed on 2007-07-19 that this hook was originally
used by SELinux but can now be safely removed:

     http://marc.info/?l=linux-kernel&m=118485683612916&w=2

Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: James Morris <jmorris@namei.org>
Cc: Eric Paris <eparis@parisplace.org>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 0 insertions, 8 deletions

diff --git a/include/linux/security.h b/include/linux/security.h
index cbd970a735f..2e2c63faead 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -249,9 +249,6 @@ struct request_sock;
  *      @mnt contains the mounted file system.
  *      @flags contains the new filesystem flags.
  *      @data contains the filesystem-specific data.
- * @sb_post_mountroot:
- *      Update the security module's state when the root filesystem is mounted.
- *      This hook is only called if the mount was successful.
  * @sb_post_addmount:
  *      Update the security module's state when a filesystem is mounted.
  *      This hook is called any time a mount is successfully grafetd to
@@ -1257,7 +1254,6 @@ struct security_operations {
         void (*sb_umount_busy) (struct vfsmount * mnt);
         void (*sb_post_remount) (struct vfsmount * mnt,
                                  unsigned long flags, void *data);
-        void (*sb_post_mountroot) (void);
         void (*sb_post_addmount) (struct vfsmount * mnt,
                                   struct nameidata * mountpoint_nd);
         int (*sb_pivotroot) (struct nameidata * old_nd,
@@ -1524,7 +1520,6 @@ int security_sb_umount(struct vfsmount *mnt, int flags);
 void security_sb_umount_close(struct vfsmount *mnt);
 void security_sb_umount_busy(struct vfsmount *mnt);
 void security_sb_post_remount(struct vfsmount *mnt, unsigned long flags, void *data);
-void security_sb_post_mountroot(void);
 void security_sb_post_addmount(struct vfsmount *mnt, struct nameidata *mountpoint_nd);
 int security_sb_pivotroot(struct nameidata *old_nd, struct nameidata *new_nd);
 void security_sb_post_pivotroot(struct nameidata *old_nd, struct nameidata *new_nd);
@@ -1813,9 +1808,6 @@ static inline void security_sb_post_remount (struct vfsmount *mnt,
                                              unsigned long flags, void *data)
 { }
 
-static inline void security_sb_post_mountroot (void)
-{ }
-
 static inline void security_sb_post_addmount (struct vfsmount *mnt,
                                               struct nameidata *mountpoint_nd)
 { }