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net/appletalk: fix minor pointer leak to userspace in SIOCFINDIPDDPRT
authorWilly Tarreau <w@1wt.eu>
Wed, 12 Sep 2018 05:36:35 +0000 (07:36 +0200)
committerDavid S. Miller <davem@davemloft.net>
Thu, 13 Sep 2018 17:35:57 +0000 (10:35 -0700)
commitbf664ce1a66563c955db967c4f11d2fbeaba889e
tree60fb9379f5c1fd396025a630e9d21f0742e70563tree | snapshot
parentd5234b71ecda1757321f479fb70c3b394115c6decommit | diff
net/appletalk: fix minor pointer leak to userspace in SIOCFINDIPDDPRT

Fields ->dev and ->next of struct ipddp_route may be copied to
userspace on the SIOCFINDIPDDPRT ioctl. This is only accessible
to CAP_NET_ADMIN though. Let's manually copy the relevant fields
instead of using memcpy().

BugLink: http://blog.infosectcbr.com.au/2018/09/linux-kernel-infoleaks.html
Cc: Jann Horn <jannh@google.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/appletalk/ipddp.c diff | blob | history
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