linux-kernel - Re: [PATCH v4 11/16] securityfs: Only use simple_pin_fs/simple_release_fs for init_user

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Message-ID: <20211208124645.rrt2zs5kq4qzftw5@wittgenstein>
Date:   Wed, 8 Dec 2021 13:46:45 +0100
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Stefan Berger <stefanb@...ux.ibm.com>
Cc:     linux-integrity@...r.kernel.org, zohar@...ux.ibm.com,
        serge@...lyn.com, containers@...ts.linux.dev,
        dmitry.kasatkin@...il.com, ebiederm@...ssion.com,
        krzysztof.struczynski@...wei.com, roberto.sassu@...wei.com,
        mpeters@...hat.com, lhinds@...hat.com, lsturman@...hat.com,
        puiterwi@...hat.com, jejb@...ux.ibm.com, jamjoom@...ibm.com,
        linux-kernel@...r.kernel.org, paul@...l-moore.com, rgb@...hat.com,
        linux-security-module@...r.kernel.org, jmorris@...ei.org,
        James Bottomley <James.Bottomley@...senPartnership.com>
Subject: Re: [PATCH v4 11/16] securityfs: Only use
 simple_pin_fs/simple_release_fs for init_user_ns

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@...ux.ibm.com>
> Signed-off-by: James Bottomley <James.Bottomley@...senPartnership.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@...ntu.com>