From bced95283e9434611cbad8f2ff903cd396eaea72 Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Sat, 29 Dec 2007 16:20:25 -0800 Subject: [PATCH] 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 Cc: James Morris Cc: Eric Paris Cc: Chris Wright Signed-off-by: H. Peter Anvin Signed-off-by: James Morris --- include/linux/security.h | 8 -------- init/do_mounts.c | 1 - security/dummy.c | 6 ------ security/security.c | 5 ----- 4 files changed, 20 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) { } diff --git a/init/do_mounts.c b/init/do_mounts.c index 4efa1e5385e..31b2185ce30 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -470,6 +470,5 @@ void __init prepare_namespace(void) out: sys_mount(".", "/", NULL, MS_MOVE, NULL); sys_chroot("."); - security_sb_post_mountroot(); } diff --git a/security/dummy.c b/security/dummy.c index a3b29d0d00e..8e34e03415f 100644 --- a/security/dummy.c +++ b/security/dummy.c @@ -225,11 +225,6 @@ static void dummy_sb_post_remount (struct vfsmount *mnt, unsigned long flags, } -static void dummy_sb_post_mountroot (void) -{ - return; -} - static void dummy_sb_post_addmount (struct vfsmount *mnt, struct nameidata *nd) { return; @@ -1017,7 +1012,6 @@ void security_fixup_ops (struct security_operations *ops) set_to_dummy_if_null(ops, sb_umount_close); set_to_dummy_if_null(ops, sb_umount_busy); set_to_dummy_if_null(ops, sb_post_remount); - set_to_dummy_if_null(ops, sb_post_mountroot); set_to_dummy_if_null(ops, sb_post_addmount); set_to_dummy_if_null(ops, sb_pivotroot); set_to_dummy_if_null(ops, sb_post_pivotroot); diff --git a/security/security.c b/security/security.c index b13b54f0af8..5068808343d 100644 --- a/security/security.c +++ b/security/security.c @@ -288,11 +288,6 @@ void security_sb_post_remount(struct vfsmount *mnt, unsigned long flags, void *d security_ops->sb_post_remount(mnt, flags, data); } -void security_sb_post_mountroot(void) -{ - security_ops->sb_post_mountroot(); -} - void security_sb_post_addmount(struct vfsmount *mnt, struct nameidata *mountpoint_nd) { security_ops->sb_post_addmount(mnt, mountpoint_nd); -- 2.41.1