net/appletalk: fix minor pointer leak to userspace in SIOCFINDIPDDPRT

Message ID 20180912053635.GA21168@1wt.eu
State Accepted
Delegated to: David Miller
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Series
  • net/appletalk: fix minor pointer leak to userspace in SIOCFINDIPDDPRT
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Commit Message

Willy Tarreau Sept. 12, 2018, 5:36 a.m.
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>
---
 drivers/net/appletalk/ipddp.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/net/appletalk/ipddp.c b/drivers/net/appletalk/ipddp.c
index 9375cef..3d27616 100644
--- a/drivers/net/appletalk/ipddp.c
+++ b/drivers/net/appletalk/ipddp.c
@@ -283,8 +283,12 @@  static int ipddp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
                 case SIOCFINDIPDDPRT:
 			spin_lock_bh(&ipddp_route_lock);
 			rp = __ipddp_find_route(&rcp);
-			if (rp)
-				memcpy(&rcp2, rp, sizeof(rcp2));
+			if (rp) {
+				memset(&rcp2, 0, sizeof(rcp2));
+				rcp2.ip    = rp->ip;
+				rcp2.at    = rp->at;
+				rcp2.flags = rp->flags;
+			}
 			spin_unlock_bh(&ipddp_route_lock);
 
 			if (rp) {