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Fix a bug in arplookup(), whereby a hostile party on a locally

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attached network could exhaust kernel memory, and cause a system
panic, by sending a flood of spoofed ARP requests.

Approved by:	jake (mentor)
Reported by:	Apple Product Security <product-security@apple.com>
This commit is contained in:
Bruce M Simpson 2003-09-23 16:39:31 +00:00
parent b15572e3fc
commit fedf1d01a2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=120383
2 changed files with 20 additions and 6 deletions
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6
UPDATING
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@ -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

20
sys/netinet/if_ether.c
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@ -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);
}