diff options
| -rw-r--r-- | UPDATING | 6 | ||||
| -rw-r--r-- | sys/netinet/if_ether.c | 20 |
2 files changed, 20 insertions, 6 deletions
@@ -17,6 +17,12 @@ NOTE TO PEOPLE WHO THINK THAT 5.0-CURRENT IS SLOW: developers choose to disable these features on build machines to maximize performance. +20030923: + Fix a bug in arplookup(), whereby a hostile party on a locally + attached network could exhaust kernel memory, and cause a system + panic, by sending a flood of spoofed ARP requests. See + FreeBSD-SA-03:14.arp. + 20030915: A change to /etc/defaults/rc.conf now causes inetd to be started with `-C 60' if it is not overridden in /etc/rc.conf. This diff --git a/sys/netinet/if_ether.c b/sys/netinet/if_ether.c index c02ba55..22ca55e 100644 --- a/sys/netinet/if_ether.c +++ b/sys/netinet/if_ether.c @@ -918,12 +918,20 @@ arplookup(addr, create, proxy) else if (rt->rt_gateway->sa_family != AF_LINK) why = "gateway route is not ours"; - if (why && create) { - log(LOG_DEBUG, "arplookup %s failed: %s\n", - inet_ntoa(sin.sin_addr), why); - return 0; - } else if (why) { - return 0; + if (why) { + if (create) + log(LOG_DEBUG, "arplookup %s failed: %s\n", + inet_ntoa(sin.sin_addr), why); + + /* If there are no references to this route, purge it */ + if (rt->rt_refcnt <= 0 && + (rt->rt_flags & RTF_WASCLONED) != RTF_WASCLONED) { + rtrequest(RTM_DELETE, + (struct sockaddr *)rt_key(rt), + rt->rt_gateway, rt_mask(rt), + rt->rt_flags, 0); + } + return (0); } return ((struct llinfo_arp *)rt->rt_llinfo); } |
