From ed2e2bd1cb6491cc76e6681db122844400762a2e Mon Sep 17 00:00:00 2001
From: lvxiangcong <lvxiangcong@kylinos.cn>
Date: Mon, 22 Apr 2024 10:59:42 +0800
Subject: [PATCH] fix cve-2024-32473

---
 integration/network/ipvlan/ipvlan_test.go   | 25 +++++++++++++++
 integration/network/macvlan/macvlan_test.go | 29 +++++++++++++++++
 integration/networking/bridge_test.go       | 35 +++++++++++++++++++++
 libnetwork/osl/interface_linux.go           | 21 ++++++++-----
 4 files changed, 103 insertions(+), 7 deletions(-)

diff --git a/integration/network/ipvlan/ipvlan_test.go b/integration/network/ipvlan/ipvlan_test.go
index 130b60d..adb42cd 100644
--- a/integration/network/ipvlan/ipvlan_test.go
+++ b/integration/network/ipvlan/ipvlan_test.go
@@ -87,6 +87,9 @@ func TestDockerNetworkIpvlan(t *testing.T) {
 		}, {
 			name: "Addressing",
 			test: testIpvlanAddressing,
+		}, {
+			name: "NoIPv6",
+			test: testIpvlanNoIPv6,
 		},
 	} {
 
@@ -438,3 +441,25 @@ func ipvlanKernelSupport(t *testing.T) bool {
 
 	return ipvlanSupported
 }
+
+// Check that an ipvlan interface with '--ipv6=false' doesn't get kernel-assigned
+// IPv6 addresses, but the loopback interface does still have an IPv6 address ('::1').
+func testIpvlanNoIPv6(t *testing.T, ctx context.Context, client dclient.APIClient) {
+	const netName = "ipvlannet"
+	net.CreateNoError(ctx, t, client, netName, net.WithIPvlan("", "l3"))
+	assert.Check(t, n.IsNetworkAvailable(ctx, client, netName))
+
+	id := container.Run(ctx, t, client, container.WithNetworkMode(netName))
+
+	loRes := container.ExecT(ctx, t, client, id, []string{"ip", "a", "show", "dev", "lo"})
+	assert.Check(t, is.Contains(loRes.Combined(), " inet "))
+	assert.Check(t, is.Contains(loRes.Combined(), " inet6 "))
+
+	eth0Res := container.ExecT(ctx, t, client, id, []string{"ip", "a", "show", "dev", "eth0"})
+	assert.Check(t, is.Contains(eth0Res.Combined(), " inet "))
+	assert.Check(t, !strings.Contains(eth0Res.Combined(), " inet6 "),
+		"result.Combined(): %s", eth0Res.Combined())
+
+	sysctlRes := container.ExecT(ctx, t, client, id, []string{"sysctl", "-n", "net.ipv6.conf.eth0.disable_ipv6"})
+	assert.Check(t, is.Equal(strings.TrimSpace(sysctlRes.Combined()), "1"))
+}
diff --git a/integration/network/macvlan/macvlan_test.go b/integration/network/macvlan/macvlan_test.go
index c41373c..c907ffb 100644
--- a/integration/network/macvlan/macvlan_test.go
+++ b/integration/network/macvlan/macvlan_test.go
@@ -71,6 +71,9 @@ func TestDockerNetworkMacvlan(t *testing.T) {
 		}, {
 			name: "Addressing",
 			test: testMacvlanAddressing,
+		}, {
+			name: "NoIPv6",
+			test: testMacvlanNoIPv6,
 		},
 	} {
 		tc := tc
@@ -275,3 +278,29 @@ func testMacvlanAddressing(ctx context.Context, client client.APIClient) func(*t
 		assert.Check(t, strings.Contains(result.Combined(), "default via 2001:db8:abca::254 dev eth0"))
 	}
 }
+
+// Check that a macvlan interface with '--ipv6=false' doesn't get kernel-assigned
+// IPv6 addresses, but the loopback interface does still have an IPv6 address ('::1').
+func testMacvlanNoIPv6(t *testing.T, ctx context.Context, client client.APIClient) {
+	const netName = "macvlannet"
+
+	net.CreateNoError(ctx, t, client, netName,
+		net.WithMacvlan(""),
+		net.WithOption("macvlan_mode", "bridge"),
+	)
+	assert.Check(t, n.IsNetworkAvailable(ctx, client, netName))
+
+	id := container.Run(ctx, t, client, container.WithNetworkMode(netName))
+
+	loRes := container.ExecT(ctx, t, client, id, []string{"ip", "a", "show", "dev", "lo"})
+	assert.Check(t, is.Contains(loRes.Combined(), " inet "))
+	assert.Check(t, is.Contains(loRes.Combined(), " inet6 "))
+
+	eth0Res := container.ExecT(ctx, t, client, id, []string{"ip", "a", "show", "dev", "eth0"})
+	assert.Check(t, is.Contains(eth0Res.Combined(), " inet "))
+	assert.Check(t, !strings.Contains(eth0Res.Combined(), " inet6 "),
+		"result.Combined(): %s", eth0Res.Combined())
+
+	sysctlRes := container.ExecT(ctx, t, client, id, []string{"sysctl", "-n", "net.ipv6.conf.eth0.disable_ipv6"})
+	assert.Check(t, is.Equal(strings.TrimSpace(sysctlRes.Combined()), "1"))
+}
diff --git a/integration/networking/bridge_test.go b/integration/networking/bridge_test.go
index e3d1fe2..7dfcd28 100644
--- a/integration/networking/bridge_test.go
+++ b/integration/networking/bridge_test.go
@@ -3,6 +3,7 @@ package networking
 import (
 	"context"
 	"fmt"
+	"strings"
 	"testing"
 	"time"
 
@@ -477,3 +478,37 @@ func TestDefaultBridgeAddresses(t *testing.T) {
 		})
 	}
 }
+
+// Check that an interface to an '--ipv6=false' network has no IPv6
+// address - either IPAM assigned, or kernel-assigned LL, but the loopback
+// interface does still have an IPv6 address ('::1').
+func TestNonIPv6Network(t *testing.T) {
+	skip.If(t, testEnv.DaemonInfo.OSType == "windows")
+
+	ctx := setupTest(t)
+	d := daemon.New(t)
+	d.StartWithBusybox(ctx, t)
+	defer d.Stop(t)
+
+	c := d.NewClientT(t)
+	defer c.Close()
+
+	const netName = "testnet"
+	network.CreateNoError(ctx, t, c, netName)
+	defer network.RemoveNoError(ctx, t, c, netName)
+
+	id := container.Run(ctx, t, c, container.WithNetworkMode(netName))
+	defer c.ContainerRemove(ctx, id, containertypes.RemoveOptions{Force: true})
+
+	loRes := container.ExecT(ctx, t, c, id, []string{"ip", "a", "show", "dev", "lo"})
+	assert.Check(t, is.Contains(loRes.Combined(), " inet "))
+	assert.Check(t, is.Contains(loRes.Combined(), " inet6 "))
+
+	eth0Res := container.ExecT(ctx, t, c, id, []string{"ip", "a", "show", "dev", "eth0"})
+	assert.Check(t, is.Contains(eth0Res.Combined(), " inet "))
+	assert.Check(t, !strings.Contains(eth0Res.Combined(), " inet6 "),
+		"result.Combined(): %s", eth0Res.Combined())
+
+	sysctlRes := container.ExecT(ctx, t, c, id, []string{"sysctl", "-n", "net.ipv6.conf.eth0.disable_ipv6"})
+	assert.Check(t, is.Equal(strings.TrimSpace(sysctlRes.Combined()), "1"))
+}
diff --git a/libnetwork/osl/interface_linux.go b/libnetwork/osl/interface_linux.go
index 27e079d..e559ab9 100644
--- a/libnetwork/osl/interface_linux.go
+++ b/libnetwork/osl/interface_linux.go
@@ -367,17 +367,24 @@ func setInterfaceIP(nlh *netlink.Handle, iface netlink.Link, i *Interface) error
 }
 
 func setInterfaceIPv6(nlh *netlink.Handle, iface netlink.Link, i *Interface) error {
-	if i.AddressIPv6() == nil {
+	addr := i.AddressIPv6()
+	// IPv6 must be enabled on the interface if and only if the network is
+	// IPv6-enabled. For an interface on an IPv4-only network, if IPv6 isn't
+	// disabled, the interface will be put into IPv6 multicast groups making
+	// it unexpectedly susceptible to NDP cache poisoning, route injection, etc.
+	// (At present, there will always be a pre-configured IPv6 address if the
+	// network is IPv6-enabled.)
+	if err := setIPv6(i.ns.path, i.DstName(), addr != nil); err != nil {
+		return fmt.Errorf("failed to configure ipv6: %v", err)
+	}
+	if addr == nil {
 		return nil
 	}
-	if err := checkRouteConflict(nlh, i.AddressIPv6(), netlink.FAMILY_V6); err != nil {
+	if err := checkRouteConflict(nlh, addr, netlink.FAMILY_V6); err != nil {
 		return err
 	}
-	if err := setIPv6(i.ns.path, i.DstName(), true); err != nil {
-		return fmt.Errorf("failed to enable ipv6: %v", err)
-	}
-	ipAddr := &netlink.Addr{IPNet: i.AddressIPv6(), Label: "", Flags: syscall.IFA_F_NODAD}
-	return nlh.AddrAdd(iface, ipAddr)
+	nlAddr := &netlink.Addr{IPNet: addr, Label: "", Flags: syscall.IFA_F_NODAD}
+	return nlh.AddrAdd(iface, nlAddr)
 }
 
 func setInterfaceLinkLocalIPs(nlh *netlink.Handle, iface netlink.Link, i *Interface) error {
-- 
2.25.1

