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| author | mckusick <mckusick@FreeBSD.org> | 2003-10-16 02:00:12 +0000 |
|---|---|---|
| committer | mckusick <mckusick@FreeBSD.org> | 2003-10-16 02:00:12 +0000 |
| commit | 0dd6703d54f1ef4f4db724f876ae5354ffd92d50 (patch) | |
| tree | d0092517192f341403455cd4528a65e75e2a8ff3 /sys/netinet | |
| parent | 8eb262a2d5cb9805fd1a7ce374beca5787bb43f5 (diff) | |
| download | FreeBSD-src-0dd6703d54f1ef4f4db724f876ae5354ffd92d50.zip FreeBSD-src-0dd6703d54f1ef4f4db724f876ae5354ffd92d50.tar.gz | |
Malloc buckets of size 128 have been having their 64-byte offset
trashed after being freed. This has caused several panics including
kern/42277 related to soft updates. Jim Kuhn tracked the problem
down to ipfw limit rule processing. In the expiry of dynamic rules,
it is possible for an O_LIMIT_PARENT rule to be removed when it still
has live children. When the children eventually do expire, a pointer
to the (long gone) parent is dereferenced and a count decremented.
Since this memory can, and is, allocated for other purposes (in the
case of kern/42277 an inodedep structure), chaos ensues. The offset
in question in inodedep is the offset of the 16 bit count field in
the ipfw2 ipfw_dyn_rule.
Submitted by: Jim Kuhn <jkuhn@sandvine.com>
Reviewed by: "Evgueni V. Gavrilov" <aquatique@rusunix.org>
Reviewed by: Ben Pfountz <netprince@vt.edu>
MFC after: 1 week
Diffstat (limited to 'sys/netinet')
| -rw-r--r-- | sys/netinet/ip_fw2.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/sys/netinet/ip_fw2.c b/sys/netinet/ip_fw2.c index 0d3da1b..10a2bc0 100644 --- a/sys/netinet/ip_fw2.c +++ b/sys/netinet/ip_fw2.c @@ -768,8 +768,10 @@ next_pass: !TIME_LEQ( q->expire, time_second )) goto next; } - UNLINK_DYN_RULE(prev, ipfw_dyn_v[i], q); - continue; + if (q->dyn_type != O_LIMIT_PARENT || !q->count) { + UNLINK_DYN_RULE(prev, ipfw_dyn_v[i], q); + continue; + } next: prev=q; q=q->next; @@ -804,13 +806,14 @@ lookup_dyn_rule_locked(struct ipfw_flow_id *pkt, int *match_direction, goto done; /* not found */ i = hash_packet( pkt ); for (prev=NULL, q = ipfw_dyn_v[i] ; q != NULL ; ) { - if (q->dyn_type == O_LIMIT_PARENT) + if (q->dyn_type == O_LIMIT_PARENT && q->count) goto next; if (TIME_LEQ( q->expire, time_second)) { /* expire entry */ UNLINK_DYN_RULE(prev, ipfw_dyn_v[i], q); continue; } - if ( pkt->proto == q->id.proto) { + if (pkt->proto == q->id.proto && + q->dyn_type != O_LIMIT_PARENT) { if (pkt->src_ip == q->id.src_ip && pkt->dst_ip == q->id.dst_ip && pkt->src_port == q->id.src_port && |
