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SubjectRe: [PATCH review 5/6] userns: Allow the userns root to mount ramfs.
Quoting Eric W. Biederman (ebiederm@xmission.com):
>
> There is no backing store to ramfs and file creation
> rules are the same as for any other filesystem so
> it is semantically safe to allow unprivileged users
> to mount it.
>
> The memory control group successfully limits how much
> memory ramfs can consume on any system that cares about
> a user namespace root using ramfs to exhaust memory
> the memory control group can be deployed.
>
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>

> ---
> fs/ramfs/inode.c | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
> index eab8c09..c24f1e1 100644
> --- a/fs/ramfs/inode.c
> +++ b/fs/ramfs/inode.c
> @@ -260,6 +260,7 @@ static struct file_system_type ramfs_fs_type = {
> .name = "ramfs",
> .mount = ramfs_mount,
> .kill_sb = ramfs_kill_sb,
> + .fs_flags = FS_USERNS_MOUNT,
> };
> static struct file_system_type rootfs_fs_type = {
> .name = "rootfs",
> --
> 1.7.5.4


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