From: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
commit 8866df9264a34e675b4ee8a151db819b87cce2d3 upstream
Otherwise, we hit a NULL pointer deference since handlers always assume
default timeout policy is passed.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor2'.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9575 Comm: syz-executor1 Not tainted 4.19.0+ #312
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:icmp_timeout_obj_to_nlattr+0x77/0x170 net/netfilter/nf_conntrack_proto_icmp.c:297
Fixes: c779e849608a ("netfilter: conntrack: remove get_timeout() indirection")
Reported-by: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Zubin Mithra <zsm@xxxxxxxxxxxx>
---
Notes:
* Syzkaller reported a general protection fault in icmp_timeout_obj_to_nlattri
when fuzzing a 4.19 kernel.
Call Trace:
cttimeout_default_fill_info net/netfilter/nfnetlink_cttimeout.c:424 [inline]
cttimeout_default_get+0x574/0x766 net/netfilter/nfnetlink_cttimeout.c:471
nfnetlink_rcv_msg+0x544/0x5bd net/netfilter/nfnetlink.c:228
netlink_rcv_skb+0x1cf/0x2a1 net/netlink/af_netlink.c:2454
nfnetlink_rcv+0x30f/0x34a net/netfilter/nfnetlink.c:560
netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
netlink_unicast+0x3c5/0x4c3 net/netlink/af_netlink.c:1343
netlink_sendmsg+0x829/0x88e net/netlink/af_netlink.c:1908
sock_sendmsg_nosec+0x8c/0xad net/socket.c:621
sock_sendmsg+0x4f/0x60 net/socket.c:631
___sys_sendmsg+0x4d6/0x63f net/socket.c:2116
__sys_sendmsg+0xee/0x17b net/socket.c:2154
do_syscall_64+0xf8/0x133 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x49/0xbe
* This patch resolves the following conflicts when applying to 4.19:
- l3num is not used as an argument for cttimeout_default_fill_info() in 4.19
- nf_icmp_pernet, nf_tcp_pernet, nf_udp_pernet, nf_dccp_pernet,
nf_icmpv6_pernet, nf_sctp_pernet, nf_generic_pernet do not exist in
4.19. Expand the usage of those functions into one-liners.
* Tests run: Chrome OS tryjobs, Syzkaller reproducer
net/netfilter/nfnetlink_cttimeout.c | 46 +++++++++++++++++++++++++----
1 file changed, 40 insertions(+), 6 deletions(-)
diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c
index a30f8ba4b89a..1dc4ea327cbe 100644
--- a/net/netfilter/nfnetlink_cttimeout.c
+++ b/net/netfilter/nfnetlink_cttimeout.c
@@ -392,7 +392,8 @@ static int cttimeout_default_set(struct net *net, struct sock *ctnl,
static int
cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid,
u32 seq, u32 type, int event,
- const struct nf_conntrack_l4proto *l4proto)
+ const struct nf_conntrack_l4proto *l4proto,
+ const unsigned int *timeouts)
{
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
@@ -421,7 +422,7 @@ cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid,
if (!nest_parms)
goto nla_put_failure;
- ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, NULL);
+ ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts);
if (ret < 0)
goto nla_put_failure;
@@ -444,6 +445,7 @@ static int cttimeout_default_get(struct net *net, struct sock *ctnl,
struct netlink_ext_ack *extack)
{
const struct nf_conntrack_l4proto *l4proto;
+ unsigned int *timeouts = NULL;
struct sk_buff *skb2;
int ret, err;
__u16 l3num;
@@ -456,12 +458,44 @@ static int cttimeout_default_get(struct net *net, struct sock *ctnl,
l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
l4proto = nf_ct_l4proto_find_get(l3num, l4num);
- /* This protocol is not supported, skip. */
- if (l4proto->l4proto != l4num) {
- err = -EOPNOTSUPP;
+ err = -EOPNOTSUPP;
+ if (l4proto->l4proto != l4num)
goto err;
+
+ switch (l4proto->l4proto) {
+ case IPPROTO_ICMP:
+ timeouts = &net->ct.nf_ct_proto.icmp.timeout;
+ break;
+ case IPPROTO_TCP:
+ timeouts = net->ct.nf_ct_proto.tcp.timeouts;
+ break;
+ case IPPROTO_UDP:
+ timeouts = net->ct.nf_ct_proto.udp.timeouts;
+ break;
+ case IPPROTO_DCCP:
+#ifdef CONFIG_NF_CT_PROTO_DCCP
+ timeouts = net->ct.nf_ct_proto.dccp.dccp_timeout;
+#endif
+ break;
+ case IPPROTO_ICMPV6:
+ timeouts = &net->ct.nf_ct_proto.icmpv6.timeout;
+ break;
+ case IPPROTO_SCTP:
+#ifdef CONFIG_NF_CT_PROTO_SCTP
+ timeouts = net->ct.nf_ct_proto.sctp.timeouts;
+#endif
+ break;
+ case 255:
+ timeouts = &net->ct.nf_ct_proto.generic.timeout;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
}
+ if (!timeouts)
+ goto err;
+
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (skb2 == NULL) {
err = -ENOMEM;
@@ -472,7 +506,7 @@ static int cttimeout_default_get(struct net *net, struct sock *ctnl,
nlh->nlmsg_seq,
NFNL_MSG_TYPE(nlh->nlmsg_type),
IPCTNL_MSG_TIMEOUT_DEFAULT_SET,
- l4proto);
+ l4proto, timeouts);
if (ret <= 0) {
kfree_skb(skb2);
err = -ENOMEM;
--
2.21.0.392.gf8f6787159e-goog
