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[v1,16/27] SUNRPC: Use xdr_stream to encode Reply verifier in svcauth_unix_accept()

Message ID 167319540345.7490.5719470568781058899.stgit@bazille.1015granger.net (mailing list archive)
State New, archived
Headers show
Series Server-side RPC reply header parsing overhaul | expand

Commit Message

Chuck Lever Jan. 8, 2023, 4:30 p.m. UTC 
From: Chuck Lever <chuck.lever@oracle.com>

Done as part of hardening the server-side RPC header encoding path.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 net/sunrpc/svcauth_unix.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)
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Patch

diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c
index b24d6c75588f..e3981e124042 100644
--- a/net/sunrpc/svcauth_unix.c
+++ b/net/sunrpc/svcauth_unix.c
@@ -894,7 +894,6 @@  struct auth_ops svcauth_tls = {
 static int
 svcauth_unix_accept(struct svc_rqst *rqstp)
 {
-	struct kvec	*resv = &rqstp->rq_res.head[0];
 	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct svc_cred	*cred = &rqstp->rq_cred;
 	struct user_namespace *userns;
@@ -956,12 +955,12 @@  svcauth_unix_accept(struct svc_rqst *rqstp)
 		return SVC_DENIED;
 	}
 
-	/* Put NULL verifier */
-	svc_putnl(resv, RPC_AUTH_NULL);
-	svc_putnl(resv, 0);
+	svcxdr_init_encode(rqstp);
+	if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
+					  RPC_AUTH_NULL, NULL, 0) < 0)
+		return SVC_CLOSE;
 
 	rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
-	svcxdr_init_encode(rqstp);
 	return SVC_OK;
 
 badcred: