Re: [PATCH] fs/ceph/mds_client: give up on paths longer than PATH_MAX

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On Tue, Nov 19, 2024 at 9:54 AM Max Kellermann <max.kellermann@xxxxxxxxx> wrote:
>
> On Tue, Nov 19, 2024 at 2:58 PM Patrick Donnelly <pdonnell@xxxxxxxxxx> 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






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