6.5-stable review patch. If anyone has any objections, please let me know.
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From: Jeremy Kerr jk@codeconstruct.com.au
commit 5093bbfc10ab6636b32728e35813cbd79feb063c upstream.
Our current route lookups (mctp_route_lookup and mctp_route_lookup_null) traverse the net's route list without the RCU read lock held. This means the route lookup is subject to preemption, resulting in an potential grace period expiry, and so an eventual kfree() while we still have the route pointer.
Add the proper read-side critical section locks around the route lookups, preventing premption and a possible parallel kfree.
The remaining net->mctp.routes accesses are already under a rcu_read_lock, or protected by the RTNL for updates.
Based on an analysis from Sili Luo rootlab@huawei.com, where introducing a delay in the route lookup could cause a UAF on simultaneous sendmsg() and route deletion.
Reported-by: Sili Luo rootlab@huawei.com Fixes: 889b7da23abf ("mctp: Add initial routing framework") Cc: stable@vger.kernel.org Signed-off-by: Jeremy Kerr jk@codeconstruct.com.au Reviewed-by: Eric Dumazet edumazet@google.com Link: https://lore.kernel.org/r/29c4b0e67dc1bf3571df3982de87df90cae9b631.169683731... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/mctp/route.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-)
--- a/net/mctp/route.c +++ b/net/mctp/route.c @@ -737,6 +737,8 @@ struct mctp_route *mctp_route_lookup(str { struct mctp_route *tmp, *rt = NULL;
+ rcu_read_lock(); + list_for_each_entry_rcu(tmp, &net->mctp.routes, list) { /* TODO: add metrics */ if (mctp_rt_match_eid(tmp, dnet, daddr)) { @@ -747,21 +749,29 @@ struct mctp_route *mctp_route_lookup(str } }
+ rcu_read_unlock(); + return rt; }
static struct mctp_route *mctp_route_lookup_null(struct net *net, struct net_device *dev) { - struct mctp_route *rt; + struct mctp_route *tmp, *rt = NULL; + + rcu_read_lock();
- list_for_each_entry_rcu(rt, &net->mctp.routes, list) { - if (rt->dev->dev == dev && rt->type == RTN_LOCAL && - refcount_inc_not_zero(&rt->refs)) - return rt; + list_for_each_entry_rcu(tmp, &net->mctp.routes, list) { + if (tmp->dev->dev == dev && tmp->type == RTN_LOCAL && + refcount_inc_not_zero(&tmp->refs)) { + rt = tmp; + break; + } }
- return NULL; + rcu_read_unlock(); + + return rt; }
static int mctp_do_fragment_route(struct mctp_route *rt, struct sk_buff *skb,