[PATCH 004 of 8] knfsd: rpcgss : RPC_GSS_PROC_ DESTROY request will get a bad rpc

NeilBrown
2007-05-07T00:36:12Z

From: Wei Yongjun <yjwei@cn.fujitsu.com>

If I send a RPC_GSS_PROC_DESTROY message to NFSv4 server, it will reply
with a bad rpc reply which lacks an authentication verifier.
Maybe this patch is needed.

Send/recv packets as following:

send:

RemoteProcedureCall
xid
rpcvers = 2
prog = 100003
vers = 4
proc = 0
cred = AUTH_GSS
version = 1
gss_proc = 3 (RPCSEC_GSS_DESTROY)
service = 1 (RPC_GSS_SVC_NONE)
verf = AUTH_GSS
checksum

reply:

RemoteProcedureReply
xid
msg_type
reply_stat
accepted_reply

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
./net/sunrpc/auth_gss/svcauth_gss.c | 2 ++
1 file changed, 2 insertions(+)

diff .prev/net/sunrpc/auth_gss/svcauth_gss.c ./net/sunrpc/auth_gss/svcauth_gss.c
--- .prev/net/sunrpc/auth_gss/svcauth_gss.c 2007-05-07 10:31:03.000000000 +1000
+++ ./net/sunrpc/auth_gss/svcauth_gss.c 2007-05-07 10:31:04.000000000 +1000
@@ -1106,6 +1106,8 @@ svcauth_gss_accept(struct svc_rqst *rqst
}
goto complete;
case RPC_GSS_PROC_DESTROY:
+ if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
+ goto auth_err;
set_bit(CACHE_NEGATIVE, &rsci->h.flags);
if (resv->iov_len + 4 > PAGE_SIZE)
goto drop;