WSL2-Linux-Kernel/net/decnet/netfilter
Mateusz Jurczyk dd0da17b20 decnet: dn_rtmsg: Improve input length sanitization in dnrmg_receive_user_skb
Verify that the length of the socket buffer is sufficient to cover the
nlmsghdr structure before accessing the nlh->nlmsg_len field for further
input sanitization. If the client only supplies 1-3 bytes of data in
sk_buff, then nlh->nlmsg_len remains partially uninitialized and
contains leftover memory from the corresponding kernel allocation.
Operating on such data may result in indeterminate evaluation of the
nlmsg_len < sizeof(*nlh) expression.

The bug was discovered by a runtime instrumentation designed to detect
use of uninitialized memory in the kernel. The patch prevents this and
other similar tools (e.g. KMSAN) from flagging this behavior in the future.

Signed-off-by: Mateusz Jurczyk <mjurczyk@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-08 10:51:22 -04:00
..
Kconfig net/decnet/netfilter: remove depends on CONFIG_EXPERIMENTAL 2013-01-11 11:39:34 -08:00
Makefile Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dn_rtmsg.c decnet: dn_rtmsg: Improve input length sanitization in dnrmg_receive_user_skb 2017-06-08 10:51:22 -04:00