From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, linmiaohe <linmiaohe@huawei.com>,
"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.9 06/31] net: sit: fix UBSAN Undefined behaviour in check_6rd
Date: Mon, 18 Mar 2019 10:25:41 +0100 [thread overview]
Message-ID: <20190318084210.652631429@linuxfoundation.org> (raw)
In-Reply-To: <20190318084210.397476003@linuxfoundation.org>
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Miaohe Lin <linmiaohe@huawei.com>
[ Upstream commit a843dc4ebaecd15fca1f4d35a97210f72ea1473b ]
In func check_6rd,tunnel->ip6rd.relay_prefixlen may equal to
32,so UBSAN complain about it.
UBSAN: Undefined behaviour in net/ipv6/sit.c:781:47
shift exponent 32 is too large for 32-bit type 'unsigned int'
CPU: 6 PID: 20036 Comm: syz-executor.0 Not tainted 4.19.27 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1
04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xca/0x13e lib/dump_stack.c:113
ubsan_epilogue+0xe/0x81 lib/ubsan.c:159
__ubsan_handle_shift_out_of_bounds+0x293/0x2e8 lib/ubsan.c:425
check_6rd.constprop.9+0x433/0x4e0 net/ipv6/sit.c:781
try_6rd net/ipv6/sit.c:806 [inline]
ipip6_tunnel_xmit net/ipv6/sit.c:866 [inline]
sit_tunnel_xmit+0x141c/0x2720 net/ipv6/sit.c:1033
__netdev_start_xmit include/linux/netdevice.h:4300 [inline]
netdev_start_xmit include/linux/netdevice.h:4309 [inline]
xmit_one net/core/dev.c:3243 [inline]
dev_hard_start_xmit+0x17c/0x780 net/core/dev.c:3259
__dev_queue_xmit+0x1656/0x2500 net/core/dev.c:3829
neigh_output include/net/neighbour.h:501 [inline]
ip6_finish_output2+0xa36/0x2290 net/ipv6/ip6_output.c:120
ip6_finish_output+0x3e7/0xa20 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:278 [inline]
ip6_output+0x1e2/0x720 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:444 [inline]
ip6_local_out+0x99/0x170 net/ipv6/output_core.c:176
ip6_send_skb+0x9d/0x2f0 net/ipv6/ip6_output.c:1697
ip6_push_pending_frames+0xc0/0x100 net/ipv6/ip6_output.c:1717
rawv6_push_pending_frames net/ipv6/raw.c:616 [inline]
rawv6_sendmsg+0x2435/0x3530 net/ipv6/raw.c:946
inet_sendmsg+0xf8/0x5c0 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xc8/0x110 net/socket.c:631
___sys_sendmsg+0x6cf/0x890 net/socket.c:2114
__sys_sendmsg+0xf0/0x1b0 net/socket.c:2152
do_syscall_64+0xc8/0x580 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Signed-off-by: linmiaohe <linmiaohe@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/ipv6/sit.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -767,8 +767,9 @@ static bool check_6rd(struct ip_tunnel *
pbw0 = tunnel->ip6rd.prefixlen >> 5;
pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
- d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
- tunnel->ip6rd.relay_prefixlen;
+ d = tunnel->ip6rd.relay_prefixlen < 32 ?
+ (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
+ tunnel->ip6rd.relay_prefixlen : 0;
pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
if (pbi1 > 0)
next prev parent reply other threads:[~2019-03-18 9:37 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-18 9:25 [PATCH 4.9 00/31] 4.9.164-stable review Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 01/31] ACPICA: Reference Counts: increase max to 0x4000 for large servers Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 02/31] KEYS: restrict /proc/keys by credentials at open time Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 03/31] l2tp: fix infoleak in l2tp_ip6_recvmsg() Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 04/31] net: hsr: fix memory leak in hsr_dev_finalize() Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 05/31] net/hsr: fix possible crash in add_timer() Greg Kroah-Hartman
2019-03-18 9:25 ` Greg Kroah-Hartman [this message]
2019-03-18 9:25 ` [PATCH 4.9 07/31] net/x25: fix use-after-free in x25_device_event() Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 08/31] net/x25: reset state in x25_connect() Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 09/31] pptp: dst_release sk_dst_cache in pptp_sock_destruct Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 10/31] ravb: Decrease TxFIFO depth of Q3 and Q2 to one Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 11/31] route: set the deleted fnhe fnhe_daddr to 0 in ip_del_fnhe to fix a race Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 12/31] tcp: handle inet_csk_reqsk_queue_add() failures Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 13/31] vxlan: test dev->flags & IFF_UP before calling gro_cells_receive() Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 14/31] net/mlx4_core: Fix reset flow when in command polling mode Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 15/31] net/mlx4_core: Fix locking in SRIOV mode when switching between events and polling Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 16/31] net/mlx4_core: Fix qp mtt size calculation Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 17/31] net/x25: fix a race in x25_bind() Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 18/31] mdio_bus: Fix use-after-free on device_register fails Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 19/31] net: Set rtm_table to RT_TABLE_COMPAT for ipv6 for tables > 255 Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 20/31] missing barriers in some of unix_sock ->addr and ->path accesses Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 21/31] ipvlan: disallow userns cap_net_admin to change global mode/flags Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 22/31] vxlan: Fix GRO cells race condition between receive and link delete Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 23/31] rxrpc: Fix client call queueing, waiting for channel Greg Kroah-Hartman
2019-03-18 9:25 ` [PATCH 4.9 24/31] gro_cells: make sure device is up in gro_cells_receive() Greg Kroah-Hartman
2019-03-18 9:26 ` [PATCH 4.9 25/31] tcp/dccp: remove reqsk_put() from inet_child_forget() Greg Kroah-Hartman
2019-03-18 9:26 ` [PATCH 4.9 26/31] perf/x86: Fixup typo in stub functions Greg Kroah-Hartman
2019-03-18 9:26 ` [PATCH 4.9 27/31] ALSA: bebob: use more identical mod_alias for Saffire Pro 10 I/O against Liquid Saffire 56 Greg Kroah-Hartman
2019-03-18 9:26 ` [PATCH 4.9 28/31] Its wrong to add len to sector_nr in raid10 reshape twice Greg Kroah-Hartman
2019-03-18 9:26 ` [PATCH 4.9 29/31] mmc: tmio_mmc_core: dont claim spurious interrupts Greg Kroah-Hartman
2019-03-18 9:26 ` [PATCH 4.9 30/31] of: Support const and non-const use for to_of_node() Greg Kroah-Hartman
2019-03-18 9:26 ` [PATCH 4.9 31/31] vhost/vsock: fix vhost vsock cid hashing inconsistent Greg Kroah-Hartman
2019-03-18 14:02 ` [PATCH 4.9 00/31] 4.9.164-stable review kernelci.org bot
2019-03-18 16:23 ` Naresh Kamboju
2019-03-19 2:24 ` Guenter Roeck
2019-03-19 10:33 ` Jon Hunter
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