selftests: tls: add test with a partially invalid iov

Make sure that we don't return more bytes than we actually received if
the userspace buffer was bogus. We expect to receive at least the rest
of rec1, and possibly some of rec2 (currently, we don't, but that
would be ok).
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/720e61b3d3eab40af198a58ce2cd1ee019f0ceb1.1711120964.git.sd@queasysnail.netSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/tls.c

@@ -1615,6 +1615,40 @@ TEST_F(tls, getsockopt)
 	EXPECT_EQ(errno, EINVAL);
 }
 
+TEST_F(tls, recv_efault)
+{
+	char *rec1 = "1111111111";
+	char *rec2 = "2222222222";
+	struct msghdr hdr = {};
+	struct iovec iov[2];
+	char recv_mem[12];
+	int ret;
+
+	if (self->notls)
+		SKIP(return, "no TLS support");
+
+	EXPECT_EQ(send(self->fd, rec1, 10, 0), 10);
+	EXPECT_EQ(send(self->fd, rec2, 10, 0), 10);
+
+	iov[0].iov_base = recv_mem;
+	iov[0].iov_len = sizeof(recv_mem);
+	iov[1].iov_base = NULL; /* broken iov to make process_rx_list fail */
+	iov[1].iov_len = 1;
+
+	hdr.msg_iovlen = 2;
+	hdr.msg_iov = iov;
+
+	EXPECT_EQ(recv(self->cfd, recv_mem, 1, 0), 1);
+	EXPECT_EQ(recv_mem[0], rec1[0]);
+
+	ret = recvmsg(self->cfd, &hdr, 0);
+	EXPECT_LE(ret, sizeof(recv_mem));
+	EXPECT_GE(ret, 9);
+	EXPECT_EQ(memcmp(rec1, recv_mem, 9), 0);
+	if (ret > 9)
+		EXPECT_EQ(memcmp(rec2, recv_mem + 9, ret - 9), 0);
+}
+
 FIXTURE(tls_err)
 {
 	int fd, cfd;