Re: [RFC][PATCH] sunrpc: fix oops in rpc_create() when the mount namespace is unshared

From: Chuck Lever
Date: Thu Sep 11 2008 - 12:45:17 EST


On Sep 11, 2008, at Sep 11, 2008, 5:02 AM, Cedric Le Goater wrote:
The conservative play is to always force use of the initial namespace
and to deny creation of mounts that would use different namespaces. In part
because the initial version of the namespace always exists. Which means
as relates to Cedrics initial patch we would still need to know which
mounts should cause us to use a different uts namespace so we can deny

I will send the initial patch which forces use of the initial namespace because
it does fix a real oops.

Today's patch looks reasonable to me. I would add a FIXME comment in net/sunrpc/clnt.c near the site of the fix.

Then, I should be able to find some time to work on improving the uts namespace
checks when NFS mounts are done.

As a final note, I don't think this is an issue only for NFS mounts. The problem is with how AUTH_SYS RPC credentials are formed.

cl_nodename is a copy of utsname kept in the rpc_clnt structure for efficiency. I think the auth_unix code has to be more sensitive to which utsname is "in effect" for each RPC request. We probably can't use the same utsname for all RPC requests for the life of an RPC client. And since RPC credentials are cached, we should be more careful about which cached credential is selected.

Chuck Lever
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