linux-kernel - Re: [PATCH] fs/ceph/mds_client: give up on paths longer than PATH

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Message-ID: <CA+2bHPZW5ngyrAs8LaYzm__HGewf0De51MvffNZW4h+WX7kfwA@mail.gmail.com>
Date: Tue, 19 Nov 2024 10:13:57 -0500
From: Patrick Donnelly <pdonnell@...hat.com>
To: Max Kellermann <max.kellermann@...os.com>
Cc: Jeff Layton <jlayton@...nel.org>, Ilya Dryomov <idryomov@...il.com>, 
	Venky Shankar <vshankar@...hat.com>, xiubli@...hat.com, ceph-devel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, dario@...e53.de, stable@...r.kernel.org
Subject: Re: [PATCH] fs/ceph/mds_client: give up on paths longer than PATH_MAX

On Tue, Nov 19, 2024 at 9:54 AM Max Kellermann <max.kellermann@...os.com> wrote:
>
> On Tue, Nov 19, 2024 at 2:58 PM Patrick Donnelly <pdonnell@...hat.com> wrote:
> > The protocol does **not** require building the full path for most
> > operations unless it involves a snapshot.
>
> We don't use Ceph snapshots, but before today's emergency update, we
> could shoot down an arbitrary server with a single (unprivileged)
> system call using this vulnerability.
>
> I'm not sure what your point is, but this vulnerability exists, it
> works without snapshots and we think it's serious.

I'm not suggesting there isn't a bug. I'm correcting a misunderstanding.

-- 
Patrick Donnelly, Ph.D.
He / Him / His
Red Hat Partner Engineer
IBM, Inc.
GPG: 19F28A586F808C2402351B93C3301A3E258DD79D