svn commit: r309845 - stable/11/sys/netpfil/pf
Marcel Moolenaar
marcel at FreeBSD.org
Sun Dec 11 04:02:40 UTC 2016
Author: marcel
Date: Sun Dec 11 04:02:38 2016
New Revision: 309845
URL: https://svnweb.freebsd.org/changeset/base/309845
Log:
MFC r309394, r309787
Fix use-after-free bugs in pfsync(4)
Modified:
stable/11/sys/netpfil/pf/if_pfsync.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/netpfil/pf/if_pfsync.c
==============================================================================
--- stable/11/sys/netpfil/pf/if_pfsync.c Sun Dec 11 03:59:37 2016 (r309844)
+++ stable/11/sys/netpfil/pf/if_pfsync.c Sun Dec 11 04:02:38 2016 (r309845)
@@ -161,8 +161,8 @@ static struct pfsync_q pfsync_qs[] = {
{ pfsync_out_del, sizeof(struct pfsync_del_c), PFSYNC_ACT_DEL_C }
};
-static void pfsync_q_ins(struct pf_state *, int);
-static void pfsync_q_del(struct pf_state *);
+static void pfsync_q_ins(struct pf_state *, int, bool);
+static void pfsync_q_del(struct pf_state *, bool);
static void pfsync_update_state(struct pf_state *);
@@ -542,7 +542,7 @@ pfsync_state_import(struct pfsync_state
if (!(flags & PFSYNC_SI_IOCTL)) {
st->state_flags &= ~PFSTATE_NOSYNC;
if (st->state_flags & PFSTATE_ACK) {
- pfsync_q_ins(st, PFSYNC_S_IACK);
+ pfsync_q_ins(st, PFSYNC_S_IACK, true);
pfsync_push(sc);
}
}
@@ -1509,7 +1509,7 @@ pfsync_sendout(int schedswi)
struct ip *ip;
struct pfsync_header *ph;
struct pfsync_subheader *subh;
- struct pf_state *st;
+ struct pf_state *st, *st_next;
struct pfsync_upd_req_item *ur;
int offset;
int q, count = 0;
@@ -1559,7 +1559,7 @@ pfsync_sendout(int schedswi)
offset += sizeof(*subh);
count = 0;
- TAILQ_FOREACH(st, &sc->sc_qs[q], sync_list) {
+ TAILQ_FOREACH_SAFE(st, &sc->sc_qs[q], sync_list, st_next) {
KASSERT(st->sync_state == q,
("%s: st->sync_state == q",
__func__));
@@ -1668,7 +1668,7 @@ pfsync_insert_state(struct pf_state *st)
if (sc->sc_len == PFSYNC_MINPKT)
callout_reset(&sc->sc_tmo, 1 * hz, pfsync_timeout, V_pfsyncif);
- pfsync_q_ins(st, PFSYNC_S_INS);
+ pfsync_q_ins(st, PFSYNC_S_INS, true);
PFSYNC_UNLOCK(sc);
st->sync_updates = 0;
@@ -1789,7 +1789,7 @@ static void
pfsync_update_state(struct pf_state *st)
{
struct pfsync_softc *sc = V_pfsyncif;
- int sync = 0;
+ bool sync = false, ref = true;
PF_STATE_LOCK_ASSERT(st);
PFSYNC_LOCK(sc);
@@ -1798,7 +1798,7 @@ pfsync_update_state(struct pf_state *st)
pfsync_undefer_state(st, 0);
if (st->state_flags & PFSTATE_NOSYNC) {
if (st->sync_state != PFSYNC_S_NONE)
- pfsync_q_del(st);
+ pfsync_q_del(st, true);
PFSYNC_UNLOCK(sc);
return;
}
@@ -1815,14 +1815,17 @@ pfsync_update_state(struct pf_state *st)
if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) {
st->sync_updates++;
if (st->sync_updates >= sc->sc_maxupdates)
- sync = 1;
+ sync = true;
}
break;
case PFSYNC_S_IACK:
- pfsync_q_del(st);
+ pfsync_q_del(st, false);
+ ref = false;
+ /* FALLTHROUGH */
+
case PFSYNC_S_NONE:
- pfsync_q_ins(st, PFSYNC_S_UPD_C);
+ pfsync_q_ins(st, PFSYNC_S_UPD_C, ref);
st->sync_updates = 0;
break;
@@ -1880,13 +1883,14 @@ static void
pfsync_update_state_req(struct pf_state *st)
{
struct pfsync_softc *sc = V_pfsyncif;
+ bool ref = true;
PF_STATE_LOCK_ASSERT(st);
PFSYNC_LOCK(sc);
if (st->state_flags & PFSTATE_NOSYNC) {
if (st->sync_state != PFSYNC_S_NONE)
- pfsync_q_del(st);
+ pfsync_q_del(st, true);
PFSYNC_UNLOCK(sc);
return;
}
@@ -1894,9 +1898,12 @@ pfsync_update_state_req(struct pf_state
switch (st->sync_state) {
case PFSYNC_S_UPD_C:
case PFSYNC_S_IACK:
- pfsync_q_del(st);
+ pfsync_q_del(st, false);
+ ref = false;
+ /* FALLTHROUGH */
+
case PFSYNC_S_NONE:
- pfsync_q_ins(st, PFSYNC_S_UPD);
+ pfsync_q_ins(st, PFSYNC_S_UPD, ref);
pfsync_push(sc);
break;
@@ -1917,13 +1924,14 @@ static void
pfsync_delete_state(struct pf_state *st)
{
struct pfsync_softc *sc = V_pfsyncif;
+ bool ref = true;
PFSYNC_LOCK(sc);
if (st->state_flags & PFSTATE_ACK)
pfsync_undefer_state(st, 1);
if (st->state_flags & PFSTATE_NOSYNC) {
if (st->sync_state != PFSYNC_S_NONE)
- pfsync_q_del(st);
+ pfsync_q_del(st, true);
PFSYNC_UNLOCK(sc);
return;
}
@@ -1934,22 +1942,24 @@ pfsync_delete_state(struct pf_state *st)
switch (st->sync_state) {
case PFSYNC_S_INS:
/* We never got to tell the world so just forget about it. */
- pfsync_q_del(st);
+ pfsync_q_del(st, true);
break;
case PFSYNC_S_UPD_C:
case PFSYNC_S_UPD:
case PFSYNC_S_IACK:
- pfsync_q_del(st);
- /* FALLTHROUGH to putting it on the del list */
+ pfsync_q_del(st, false);
+ ref = false;
+ /* FALLTHROUGH */
case PFSYNC_S_NONE:
- pfsync_q_ins(st, PFSYNC_S_DEL);
+ pfsync_q_ins(st, PFSYNC_S_DEL, ref);
break;
default:
panic("%s: unexpected sync state %d", __func__, st->sync_state);
}
+
PFSYNC_UNLOCK(sc);
}
@@ -1977,7 +1987,7 @@ pfsync_clear_states(u_int32_t creatorid,
}
static void
-pfsync_q_ins(struct pf_state *st, int q)
+pfsync_q_ins(struct pf_state *st, int q, bool ref)
{
struct pfsync_softc *sc = V_pfsyncif;
size_t nlen = pfsync_qs[q].len;
@@ -2001,11 +2011,12 @@ pfsync_q_ins(struct pf_state *st, int q)
sc->sc_len += nlen;
TAILQ_INSERT_TAIL(&sc->sc_qs[q], st, sync_list);
st->sync_state = q;
- pf_ref_state(st);
+ if (ref)
+ pf_ref_state(st);
}
static void
-pfsync_q_del(struct pf_state *st)
+pfsync_q_del(struct pf_state *st, bool unref)
{
struct pfsync_softc *sc = V_pfsyncif;
int q = st->sync_state;
@@ -2017,7 +2028,8 @@ pfsync_q_del(struct pf_state *st)
sc->sc_len -= pfsync_qs[q].len;
TAILQ_REMOVE(&sc->sc_qs[q], st, sync_list);
st->sync_state = PFSYNC_S_NONE;
- pf_release_state(st);
+ if (unref)
+ pf_release_state(st);
if (TAILQ_EMPTY(&sc->sc_qs[q]))
sc->sc_len -= sizeof(struct pfsync_subheader);
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