[Devel] [PATCH] fs: don't add MNT_NODEV for ve mounts

[Pavel Tikhomirov]

Acked-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>

On 10/07/2015 10:59 AM, Andrew Vagin wrote:
> Reported-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
> Signed-off-by: Andrew Vagin <avagin at openvz.org>
> ---
>   fs/namespace.c       |    8 +++++++-
>   scripts/basic/fixdep |  Bin 13875 -> 14262 bytes
>   2 files changed, 7 insertions(+), 1 deletions(-)
>
> diff --git a/fs/namespace.c b/fs/namespace.c
> index 77a1ede..1377488 100644
> --- a/fs/namespace.c
> +++ b/fs/namespace.c
> @@ -2167,6 +2167,7 @@ static int do_new_mount(struct path *path, const char *fstype, int flags,
>   	struct file_system_type *type;
>   	struct user_namespace *user_ns = current->nsproxy->mnt_ns->user_ns;
>   	struct vfsmount *mnt;
> +	struct user_namespace *root_user_ns;
>   	int err;
>
>   	if (!fstype)
> @@ -2176,7 +2177,12 @@ static int do_new_mount(struct path *path, const char *fstype, int flags,
>   	if (!type)
>   		return -ENODEV;
>
> -	if (user_ns != &init_user_ns) {
> +	if (get_exec_env()->init_cred)
> +		root_user_ns = get_exec_env()->init_cred->user_ns;
> +	else
> +		root_user_ns = &init_user_ns;
> +
> +	if (user_ns != root_user_ns) {
>   		if (!(type->fs_flags & FS_USERNS_MOUNT)) {
>   			put_filesystem(type);
>   			return -EPERM;
>

-- 
Best regards, Tikhomirov Pavel
Software Developer, Odin.