Re: [PATCH 0/6] File Sealing & memfd_create()

[Florian Weimer]

On 04/22/2014 01:55 PM, David Herrmann wrote:
> Hi
>
> On Tue, Apr 22, 2014 at 11:10 AM, Florian Weimer <fweimer@xxxxxxxxxx> wrote:
> > Ah.  What do you recommend for recipient to recognize such descriptors?
> > Would they just try to seal them and reject them if this fails?
>
> This highly depends on your use-case. Please see the initial email in
> this thread. It describes 2 example use-cases. In both cases, the
> recipients read the current set of seals and verify that a given set
> of seals is set.

I didn't find that very convincing.  But in v2, seals are monotonic, so 
checking them should be reliable enough.

What happens when you create a loop device on a write-sealed descriptor?

--
Florian Weimer / Red Hat Product Security Team
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