Re: [PATCH] repair nfsd/sunrpc in 2.6.14-rc2-mm1 (and other -mm versions)

[Steve Dickson <SteveD@redhat.com>]

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Max Kellermann wrote:
> Your -mm patches make the sunrpc client connect to the portmapper with
> a non-privileged source port.  This is due to a change in
> net/sunrpc/pmap_clnt.c, which manually resets the xprt->resvport
> field.  My tiny patch removes this line.  I have no idea why the line
> was added in the first place, does somebody know better?
Yes this is a bug, since most Linux portmapper will not
allow ports to be set or unset using non-privilege ports.
But non-privilege ports can be used to get ports information.
So I would suggest the following patch that stops the
use of privileges ports on only get port requests.

steved.

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Privilege ports are need for services to set and unset ports, but
are not needed to get ports. This patch eliminates the use of
privilege ports for PMAP_GETPORT rpcs and restores the use
of privilege ports for PMAP_SET  and  PMAP_UNSET rpcs.

Signed-off-by: Steve Dickson <steved@redhat.com>

-------------------------
--- 2.6.14-rc2-mm1/net/sunrpc/pmap_clnt.c.orig	2005-09-22 09:42:28.394681000 -0400
+++ 2.6.14-rc2-mm1/net/sunrpc/pmap_clnt.c	2005-09-22 09:52:51.777617000 -0400
@@ -70,6 +70,8 @@ rpc_getport(struct rpc_task *task, struc
 		task->tk_status = PTR_ERR(pmap_clnt);
 		goto bailout;
 	}
+	/* Don't need reserved ports to get ports from portmappers */
+	pmap_clnt->cl_xprt->resvport = 0;
 	task->tk_status = 0;
 
 	/*
@@ -208,7 +210,6 @@ pmap_create(char *hostname, struct socka
 	if (IS_ERR(xprt))
 		return (struct rpc_clnt *)xprt;
 	xprt->addr.sin_port = htons(RPC_PMAP_PORT);
-	xprt->resvport = 0;
 
 	/* printk("pmap: create clnt\n"); */
 	clnt = rpc_new_client(xprt, hostname,