[SECURITY] L2TP send buffer allocation size overflows

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Both PPPoL2TP (in net/l2tp/l2tp_ppp.c, pppol2tp_sendmsg()) and IPoL2TP
(in net/l2tp/l2tp_ip.c, l2tp_ip_sendmsg()) make calls to sock_wmalloc()
that perform arithmetic on the size argument without any maximum bound.
As a result, by issuing sendto() calls with very large sizes, this
allocation size will wrap and result in a small buffer being allocated,
leading to ugliness immediately after (probably kernel panics due to bad
sk_buff tail position, but possibly kernel heap corruption).

This issue was just fixed in the core code with:

Even though this won't be an issue for much longer, it should still be
fixed here just in case any paths to calling these functions with large
sizes are left open.


To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Linux Kernel Discussion]     [Ethernet Bridging]     [Linux Wireless Networking]     [Linux Bluetooth Networking]     [Linux Networking Users]     [VLAN]     [Git]     [IETF Annouce]     [Linux Assembly]     [Security]     [Bugtraq]     [Photo]     [Singles Social Networking]     [Yosemite Information]     [MIPS Linux]     [ARM Linux Kernel]     [ARM Linux]     [Linux Virtualization]     [Linux Security]     [Linux IDE]     [Linux RAID]     [Linux SCSI]     [Free Dating]

Add to Google Powered by Linux