[PATCH v4 11/16] securityfs: Only use simple_pin_fs/simple_release_fs for init_user_ns

[Christian Brauner]

On Tue, Dec 07, 2021 at 03:21:22PM -0500, Stefan Berger wrote:
> To prepare for virtualization of SecurityFS, use simple_pin_fs and
> simpe_release_fs only when init_user_ns is active.
> 
> Signed-off-by: Stefan Berger <stefanb at linux.ibm.com>
> Signed-off-by: James Bottomley <James.Bottomley at HansenPartnership.com>
> ---
>  security/inode.c | 30 +++++++++++++++++++++---------
>  1 file changed, 21 insertions(+), 9 deletions(-)
> 
> diff --git a/security/inode.c b/security/inode.c
> index 6c326939750d..1a720b2c566d 100644
> --- a/security/inode.c
> +++ b/security/inode.c
> @@ -21,9 +21,10 @@
>  #include <linux/security.h>
>  #include <linux/lsm_hooks.h>
>  #include <linux/magic.h>
> +#include <linux/user_namespace.h>
>  
> -static struct vfsmount *mount;
> -static int mount_count;
> +static struct vfsmount *securityfs_mount;
> +static int securityfs_mount_count;

Maybe better:

static struct vfsmount *init_securityfs_mount;
static int init_securityfs_mount_count;

gets a bit long but gets the meaning across better plus it's a global so
not really an issue imho if it's long.

Otherwise, looks good.
Acked-by: Christian Brauner <christian.brauner at ubuntu.com>