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

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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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