Messages in this thread | | | Date | Sun, 27 Jan 2013 18:23:28 +0000 | From | "Serge E. Hallyn" <> | Subject | Re: [PATCH review 5/6] userns: Allow the userns root to mount ramfs. |
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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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