diff --git a/ssl/d1_both.c b/ssl/d1_both.c
index ac35a66..f8724ba 100644
--- a/ssl/d1_both.c
+++ b/ssl/d1_both.c
@@ -473,11 +473,7 @@
 /* dtls1_process_fragment reads a handshake fragment and processes it. It
  * returns one if a fragment was successfully processed and 0 or -1 on error. */
 static int dtls1_process_fragment(SSL *s) {
-  /* Read handshake message header.
-   *
-   * TODO(davidben): ssl_read_bytes allows splitting the fragment header and
-   * body across two records. Change this interface to consume the fragment in
-   * one pass. */
+  /* Read handshake message header. */
   uint8_t header[DTLS1_HM_HEADER_LENGTH];
   int ret = dtls1_read_bytes(s, SSL3_RT_HANDSHAKE, header,
                              DTLS1_HM_HEADER_LENGTH, 0);
@@ -494,12 +490,15 @@
   struct hm_header_st msg_hdr;
   dtls1_get_message_header(header, &msg_hdr);
 
+  /* TODO(davidben): dtls1_read_bytes is the wrong abstraction for DTLS. There
+   * should be no need to reach into |s->s3->rrec.length|. */
   const size_t frag_off = msg_hdr.frag_off;
   const size_t frag_len = msg_hdr.frag_len;
   const size_t msg_len = msg_hdr.msg_len;
   if (frag_off > msg_len || frag_off + frag_len < frag_off ||
       frag_off + frag_len > msg_len ||
-      msg_len > dtls1_max_handshake_message_len(s)) {
+      msg_len > dtls1_max_handshake_message_len(s) ||
+      frag_len > s->s3->rrec.length) {
     OPENSSL_PUT_ERROR(SSL, dtls1_process_fragment,
                       SSL_R_EXCESSIVE_MESSAGE_SIZE);
     ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
@@ -535,8 +534,8 @@
   ret = dtls1_read_bytes(s, SSL3_RT_HANDSHAKE, frag->fragment + frag_off,
                          frag_len, 0);
   if (ret != frag_len) {
-    OPENSSL_PUT_ERROR(SSL, dtls1_process_fragment, SSL_R_UNEXPECTED_MESSAGE);
-    ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
+    OPENSSL_PUT_ERROR(SSL, dtls1_process_fragment, ERR_R_INTERNAL_ERROR);
+    ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
     return -1;
   }
   dtls1_hm_fragment_mark(frag, frag_off, frag_off + frag_len);
diff --git a/ssl/test/runner/common.go b/ssl/test/runner/common.go
index 207de0c..928c2b2 100644
--- a/ssl/test/runner/common.go
+++ b/ssl/test/runner/common.go
@@ -668,17 +668,10 @@
 	// handshake fragments in DTLS to have the wrong message length.
 	FragmentMessageLengthMismatch bool
 
-	// SplitFragmentHeader, if true, causes the handshake fragments in DTLS
-	// to be split across two records.
-	SplitFragmentHeader bool
-
-	// SplitFragmentBody, if true, causes the handshake bodies in DTLS to be
-	// split across two records.
-	//
-	// TODO(davidben): There's one final split to test: when the header and
-	// body are split across two records. But those are (incorrectly)
-	// accepted right now.
-	SplitFragmentBody bool
+	// SplitFragments, if non-zero, causes the handshake fragments in DTLS
+	// to be split across two records. The value of |SplitFragments| is the
+	// number of bytes in the first fragment.
+	SplitFragments int
 
 	// SendEmptyFragments, if true, causes handshakes to include empty
 	// fragments in DTLS.
diff --git a/ssl/test/runner/dtls.go b/ssl/test/runner/dtls.go
index 50f7786..538bf51 100644
--- a/ssl/test/runner/dtls.go
+++ b/ssl/test/runner/dtls.go
@@ -216,13 +216,10 @@
 	// Pack handshake fragments into records.
 	var records [][]byte
 	for _, fragment := range fragments {
-		if c.config.Bugs.SplitFragmentHeader {
-			records = append(records, fragment[:2])
-			records = append(records, fragment[2:])
-		} else if c.config.Bugs.SplitFragmentBody {
-			if len(fragment) > 12 {
-				records = append(records, fragment[:13])
-				records = append(records, fragment[13:])
+		if n := c.config.Bugs.SplitFragments; n > 0 {
+			if len(fragment) > n {
+				records = append(records, fragment[:n])
+				records = append(records, fragment[n:])
 			} else {
 				records = append(records, fragment)
 			}
diff --git a/ssl/test/runner/runner.go b/ssl/test/runner/runner.go
index 524b3d0..f02a221 100644
--- a/ssl/test/runner/runner.go
+++ b/ssl/test/runner/runner.go
@@ -913,10 +913,10 @@
 	},
 	{
 		protocol: dtls,
-		name:     "SplitFragmentHeader-DTLS",
+		name:     "SplitFragments-Header-DTLS",
 		config: Config{
 			Bugs: ProtocolBugs{
-				SplitFragmentHeader: true,
+				SplitFragments: 2,
 			},
 		},
 		shouldFail:    true,
@@ -924,14 +924,25 @@
 	},
 	{
 		protocol: dtls,
-		name:     "SplitFragmentBody-DTLS",
+		name:     "SplitFragments-Boundary-DTLS",
 		config: Config{
 			Bugs: ProtocolBugs{
-				SplitFragmentBody: true,
+				SplitFragments: dtlsRecordHeaderLen,
 			},
 		},
 		shouldFail:    true,
-		expectedError: ":UNEXPECTED_MESSAGE:",
+		expectedError: ":EXCESSIVE_MESSAGE_SIZE:",
+	},
+	{
+		protocol: dtls,
+		name:     "SplitFragments-Body-DTLS",
+		config: Config{
+			Bugs: ProtocolBugs{
+				SplitFragments: dtlsRecordHeaderLen + 1,
+			},
+		},
+		shouldFail:    true,
+		expectedError: ":EXCESSIVE_MESSAGE_SIZE:",
 	},
 	{
 		protocol: dtls,