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

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Message-ID: <CAKPOu+8k9ze37v8YKqdHJZdPs8gJfYQ9=nNAuPeWr+eWg=yQ5Q@mail.gmail.com>
Date: Tue, 19 Nov 2024 15:54:32 +0100
From: Max Kellermann <max.kellermann@...os.com>
To: Patrick Donnelly <pdonnell@...hat.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 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.