is
    rejected, printing explanatory messages on each request attempt is
    a remote log filler that could be triggered by accident, and the generic
    RPC code generally does not do that.  These printf() calls should be
    restored only after some limiting or configuration mechanism is devised.
    
    MFC with:       d4cc791f3b2e ("sys/rpc: UNIX auth: Fix OOB reads on too short message")
    Sponsored by:   The FreeBSD Foundation
---
 sys/rpc/svc_auth_unix.c | 20 +++-----------------
 1 file changed, 3 insertions(+), 17 deletions(-)

diff --git a/sys/rpc/svc_auth_unix.c b/sys/rpc/svc_auth_unix.c
index 9e4b0b8483b5..aa0fc585865f 100644
--- a/sys/rpc/svc_auth_unix.c
+++ b/sys/rpc/svc_auth_unix.c
@@ -41,7 +41,6 @@
  */
 
 #include <sys/param.h>
-#include <sys/systm.h>
 #include <sys/ucred.h>
 
 #include <rpc/rpc.h>
@@ -70,11 +69,8 @@ _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
 		const uint32_t min_len = 5 * BYTES_PER_XDR_UNIT;
 		uint32_t str_len, supp_ngroups;
 
-		if (auth_len < min_len) {
-			(void)printf("AUTH_SYS: Too short credentials (%u)\n",
-			    auth_len);
+		if (auth_len < min_len)
 			goto badcred;
-		}
 		time = IXDR_GET_UINT32(buf);
 		str_len = IXDR_GET_UINT32(buf);
 		if (str_len > AUTH_SYS_MAX_HOSTNAME)
@@ -85,12 +81,8 @@ _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
 		 * 'str_len' (and that it won't cause an overflow in additions
 		 * below) to protect access to the credentials part.
 		 */
-		if (auth_len < min_len + str_len) {
-			(void)printf("AUTH_SYS: Inconsistent credentials and "
-			    "host name lengths (%u, %u)\n",
-			    auth_len, str_len);
+		if (auth_len < min_len + str_len)
 			goto badcred;
-		}
 		buf += str_len / sizeof (int32_t);
 		xcr->cr_uid = IXDR_GET_UINT32(buf);
 		xcr->cr_gid = IXDR_GET_UINT32(buf);
@@ -108,14 +100,8 @@ _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
 		 * read in total.
 		 */
 		if (auth_len < min_len + str_len +
-		    supp_ngroups * BYTES_PER_XDR_UNIT) {
-			(void)printf("AUTH_SYS: Inconsistent lengths "
-			    "(credentials %u, machine name %u, "
-			    "supplementary groups %u)\n",
-			    auth_len, str_len,
-			    supp_ngroups * BYTES_PER_XDR_UNIT);
+		    supp_ngroups * BYTES_PER_XDR_UNIT)
 			goto badcred;
-		}
 
 		/*
 		 * Note that 'xcr' is a 'struct xucred', which still has the