Or Cohen 03ca1f09ab net/packet: fix overflow in tpacket_rcv ...

[ Upstream commit acf69c9462 ]

Using tp_reserve to calculate netoff can overflow as
tp_reserve is unsigned int and netoff is unsigned short.

This may lead to macoff receving a smaller value then
sizeof(struct virtio_net_hdr), and if po->has_vnet_hdr
is set, an out-of-bounds write will occur when
calling virtio_net_hdr_from_skb.

The bug is fixed by converting netoff to unsigned int
and checking if it exceeds USHRT_MAX.

This addresses CVE-2020-14386

Fixes: 8913336a7e ("packet: add PACKET_RESERVE sockopt")
Signed-off-by: Or Cohen <orcohen@paloaltonetworks.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2020-09-09 19:14:23 +02:00

..

af_packet.c

net/packet: fix overflow in tpacket_rcv

2020-09-09 19:14:23 +02:00

diag.c

treewide: Add SPDX license identifier for more missed files

2019-05-21 10:50:45 +02:00

internal.h

net/packet: tpacket_rcv: avoid a producer race condition

2020-03-15 00:25:25 -07:00

Kconfig

treewide: replace '---help---' in Kconfig files with 'help'

2020-06-14 01:57:21 +09:00

Makefile

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21 10:50:46 +02:00