[PATCH] [RFC] c/r: Add UTS support
danms at us.ibm.com
Thu Mar 12 15:56:40 PDT 2009
SH> Well it forces restart to go through the established userspace
SH> API's when creating resources (in this case, tasks and namespaces)
SH> which means any existing security guarantees are leveraged.
That's a very valid point. However, it still seems unbalanced to make
checkpoint a completely in-kernel process and restart an odd mix of
the two with potentially more confusing semantics and requirements.
SH> If we go with your patch, we suddenly have to worry about whether
SH> restart is a way to get around the CAP_SYS_ADMIN requirements for
SH> cloning a new namespace. Just as an example.
Why? The call to copy_namespaces() will do the CAP_SYS_ADMIN check,
right? Maybe your point is that in the restart implementation of
other namespace types we could potentially slide in a call to
something else that has already assumed the check has been made? I
think that doing the obligatory copy_namespaces() during the restart
helps catch that case early and explicitly, no?
IBM Linux Technology Center
email: danms at us.ibm.com
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