linux-kernel - Re: [PATCH] Fix user namespace leak

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Date:   Fri, 15 Oct 2021 21:19:46 +0000
From:   Trond Myklebust <trondmy@...merspace.com>
To:     "legion@...nel.org" <legion@...nel.org>,
        "ebiederm@...ssion.com" <ebiederm@...ssion.com>
CC:     "linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
        "sargun@...gun.me" <sargun@...gun.me>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "anna.schumaker@...app.com" <anna.schumaker@...app.com>
Subject: Re: [PATCH] Fix user namespace leak

On Fri, 2021-10-15 at 09:43 -0500, Eric W. Biederman wrote:
> Alexey Gladkov <legion@...nel.org> writes:
> 
> > Fixes: 61ca2c4afd9d ("NFS: Only reference user namespace from
> > nfs4idmap struct instead of cred")
> > Signed-off-by: Alexey Gladkov <legion@...nel.org>
> 
> Reviewed-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> 
> nfs folks do you want to pick this up?

It is in my testing branch,

> 
> > ---
> >  fs/nfs/nfs4idmap.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/fs/nfs/nfs4idmap.c b/fs/nfs/nfs4idmap.c
> > index 8d8aba305ecc..f331866dd418 100644
> > --- a/fs/nfs/nfs4idmap.c
> > +++ b/fs/nfs/nfs4idmap.c
> > @@ -487,7 +487,7 @@ nfs_idmap_new(struct nfs_client *clp)
> >  err_destroy_pipe:
> >         rpc_destroy_pipe_data(idmap->idmap_pipe);
> >  err:
> > -       get_user_ns(idmap->user_ns);
> > +       put_user_ns(idmap->user_ns);
> >         kfree(idmap);
> >         return error;
> >  }

-- 
Trond Myklebust
Linux NFS client maintainer, Hammerspace
trond.myklebust@...merspace.com