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Re: [Xen-devel] [PATCH] xenstored: allow guests to reintroduce themselves

On 08/01/2011 01:38 PM, Olaf Hering wrote:
# HG changeset patch
# User Olaf Hering<olaf@xxxxxxxxx>
# Date 1312202176 -7200
# Node ID edb96c34f4a638e8ba97933b6bd76ff72836353e
# Parent  0f36c2eec2e1576b4db6538b5f22d625587c1a15
xenstored: allow guests to reintroduce themselves

During kexec all old watches have to be removed, otherwise the new
kernel will receive unexpected events. Allow a guest to introduce itself
and cleanup all of its watches.

What about security wise ?

Guest userspace suddenly becomes able to do this operation (and DoS themself)
where they used to be limited to normal read/write/.. operations.

Also you're changing the C xenstored behavior without changing
the OCaml one.


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