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sctp: fix an use-after-free issue in sctp_sock_dump 

Commit 86fdb3448c ("sctp: ensure ep is not destroyed before doing the
dump") tried to fix an use-after-free issue by checking !sctp_sk(sk)->ep
with holding sock and sock lock.

But Paolo noticed that endpoint could be destroyed in sctp_rcv without
sock lock protection. It means the use-after-free issue still could be
triggered when sctp_rcv put and destroy ep after sctp_sock_dump checks
!ep, although it's pretty hard to reproduce.

I could reproduce it by mdelay in sctp_rcv while msleep in sctp_close
and sctp_sock_dump long time.

This patch is to add another param cb_done to sctp_for_each_transport
and dump ep->assocs with holding tsp after jumping out of transport's
traversal in it to avoid this issue.

It can also improve sctp diag dump to make it run faster, as no need
to save sk into cb->args[5] and keep calling sctp_for_each_transport
any more.

This patch is also to use int * instead of int for the pos argument
in sctp_for_each_transport, which could make postion increment only
in sctp_for_each_transport and no need to keep changing cb->args[2]
in sctp_sock_filter and sctp_sock_dump any more.

Fixes: 86fdb3448c ("sctp: ensure ep is not destroyed before doing the dump")
Reported-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2017-09-15 11:02:21 +08:00 committed by David S. Miller
parent 5023a6db73
commit d25adbeb0c
3 changed files with 36 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/sctp/sctp.h
View File

@ -127,7 +127,8 @@ int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
const union sctp_addr *laddr,
const union sctp_addr *paddr, void *p);
int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
struct net *net, int pos, void *p);
int (*cb_done)(struct sctp_transport *, void *),
struct net *net, int *pos, void *p);
int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *), void *p);
int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
struct sctp_info *info);

32
net/sctp/sctp_diag.c
View File

@ -279,9 +279,11 @@ out:
return err;
}
static int sctp_sock_dump(struct sock *sk, void *p)
static int sctp_sock_dump(struct sctp_transport *tsp, void *p)
{
struct sctp_endpoint *ep = tsp->asoc->ep;
struct sctp_comm_param *commp = p;
struct sock *sk = ep->base.sk;
struct sk_buff *skb = commp->skb;
struct netlink_callback *cb = commp->cb;
const struct inet_diag_req_v2 *r = commp->r;
@ -289,9 +291,7 @@ static int sctp_sock_dump(struct sock *sk, void *p)
int err = 0;
lock_sock(sk);
if (!sctp_sk(sk)->ep)
goto release;
list_for_each_entry(assoc, &sctp_sk(sk)->ep->asocs, asocs) {
list_for_each_entry(assoc, &ep->asocs, asocs) {
if (cb->args[4] < cb->args[1])
goto next;
@ -327,40 +327,30 @@ next:
cb->args[4]++;
}
cb->args[1] = 0;
cb->args[2]++;
cb->args[3] = 0;
cb->args[4] = 0;
release:
release_sock(sk);
sock_put(sk);
return err;
}
static int sctp_get_sock(struct sctp_transport *tsp, void *p)
static int sctp_sock_filter(struct sctp_transport *tsp, void *p)
{
struct sctp_endpoint *ep = tsp->asoc->ep;
struct sctp_comm_param *commp = p;
struct sock *sk = ep->base.sk;
struct netlink_callback *cb = commp->cb;
const struct inet_diag_req_v2 *r = commp->r;
struct sctp_association *assoc =
list_entry(ep->asocs.next, struct sctp_association, asocs);
/* find the ep only once through the transports by this condition */
if (tsp->asoc != assoc)
goto out;
return 0;
if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
goto out;
sock_hold(sk);
cb->args[5] = (long)sk;
return 0;
return 1;
out:
cb->args[2]++;
return 0;
}
static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
@ -503,12 +493,8 @@ skip:
if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
goto done;
next:
cb->args[5] = 0;
sctp_for_each_transport(sctp_get_sock, net, cb->args[2], &commp);
if (cb->args[5] && !sctp_sock_dump((struct sock *)cb->args[5], &commp))
goto next;
sctp_for_each_transport(sctp_sock_filter, sctp_sock_dump,
net, (int *)&cb->args[2], &commp);
done:
cb->args[1] = cb->args[4];

40
net/sctp/socket.c
View File

@ -4658,29 +4658,39 @@ int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
struct net *net, int pos, void *p) {
int (*cb_done)(struct sctp_transport *, void *),
struct net *net, int *pos, void *p) {
struct rhashtable_iter hti;
void *obj;
int err;
struct sctp_transport *tsp;
int ret;
err = sctp_transport_walk_start(&hti);
if (err)
return err;
again:
ret = sctp_transport_walk_start(&hti);
if (ret)
return ret;
obj = sctp_transport_get_idx(net, &hti, pos + 1);
for (; !IS_ERR_OR_NULL(obj); obj = sctp_transport_get_next(net, &hti)) {
struct sctp_transport *transport = obj;
if (!sctp_transport_hold(transport))
tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
if (!sctp_transport_hold(tsp))
continue;
err = cb(transport, p);
sctp_transport_put(transport);
if (err)
ret = cb(tsp, p);
if (ret)
break;
(*pos)++;
sctp_transport_put(tsp);
}
sctp_transport_walk_stop(&hti);
return err;
if (ret) {
if (cb_done && !cb_done(tsp, p)) {
(*pos)++;
sctp_transport_put(tsp);
goto again;
}
sctp_transport_put(tsp);
}
return ret;
}
EXPORT_SYMBOL_GPL(sctp_for_each_transport);