selinux: fix regression introduced by move_mount(2) syscall
commit2db154b3ea
("vfs: syscall: Add move_mount(2) to move mounts around") introduced a new move_mount(2) system call and a corresponding new LSM security_move_mount hook but did not implement this hook for any existing LSM. This creates a regression for SELinux with respect to consistent checking of mounts; the existing selinux_mount hook checks mounton permission to the mount point path. Provide a SELinux hook implementation for move_mount that applies this same check for consistency. In the future we may wish to add a new move_mount filesystem permission and check as well, but this addresses the immediate regression. Fixes:2db154b3ea
("vfs: syscall: Add move_mount(2) to move mounts around") Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Reviewed-by: Ondrej Mosnacek <omosnace@redhat.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
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@ -2724,6 +2724,14 @@ static int selinux_mount(const char *dev_name,
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return path_has_perm(cred, path, FILE__MOUNTON);
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}
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static int selinux_move_mount(const struct path *from_path,
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const struct path *to_path)
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{
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const struct cred *cred = current_cred();
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return path_has_perm(cred, to_path, FILE__MOUNTON);
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}
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static int selinux_umount(struct vfsmount *mnt, int flags)
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{
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const struct cred *cred = current_cred();
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@ -6913,6 +6921,8 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
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LSM_HOOK_INIT(sb_set_mnt_opts, selinux_set_mnt_opts),
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LSM_HOOK_INIT(sb_clone_mnt_opts, selinux_sb_clone_mnt_opts),
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LSM_HOOK_INIT(move_mount, selinux_move_mount),
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LSM_HOOK_INIT(dentry_init_security, selinux_dentry_init_security),
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LSM_HOOK_INIT(dentry_create_files_as, selinux_dentry_create_files_as),
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