From: Chuck Lever Date: Wed, 29 Jun 2016 17:55:22 +0000 (-0400) Subject: NFS: Don't drop CB requests with invalid principals X-Git-Tag: v3.2.84~134 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=84f51dca935f35cdf0cd6c27365379970908629c NFS: Don't drop CB requests with invalid principals commit a4e187d83d88eeaba6252aac0a2ffe5eaa73a818 upstream. Before commit 778be232a207 ("NFS do not find client in NFSv4 pg_authenticate"), the Linux callback server replied with RPC_AUTH_ERROR / RPC_AUTH_BADCRED, instead of dropping the CB request. Let's restore that behavior so the server has a chance to do something useful about it, and provide a warning that helps admins correct the problem. Fixes: 778be232a207 ("NFS do not find client in NFSv4 ...") Signed-off-by: Chuck Lever Tested-by: Steve Wise Signed-off-by: Anna Schumaker Signed-off-by: Ben Hutchings --- diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c index 6d22d356937b..9839726fe40c 100644 --- a/fs/nfs/callback_xdr.c +++ b/fs/nfs/callback_xdr.c @@ -878,7 +878,7 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r if (hdr_arg.minorversion == 0) { cps.clp = nfs4_find_client_ident(hdr_arg.cb_ident); if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) - return rpc_drop_reply; + goto out_invalidcred; } hdr_res.taglen = hdr_arg.taglen; @@ -905,6 +905,10 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r nfs_put_client(cps.clp); dprintk("%s: done, status = %u\n", __func__, ntohl(status)); return rpc_success; + +out_invalidcred: + pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); + return rpc_autherr_badcred; } /* diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index 9a70a8082c7c..efd443dbacf9 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -1172,6 +1172,11 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) procp->pc_release(rqstp, NULL, rqstp->rq_resp); goto dropit; } + if (*statp == rpc_autherr_badcred) { + if (procp->pc_release) + procp->pc_release(rqstp, NULL, rqstp->rq_resp); + goto err_bad_auth; + } if (*statp == rpc_success && (xdr = procp->pc_encode) && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {