From f0507f05ce57398e135651896dace4cb68eeed54 Mon Sep 17 00:00:00 2001 From: Maria Matejka Date: Mon, 27 Sep 2021 16:40:28 +0200 Subject: Route sources have an explicit owner This commit prevents use-after-free of routes belonging to protocols which have been already destroyed, delaying also all the protocols' shutdown until all of their routes have been finally propagated through all the pipes down to the appropriate exports. The use-after-free was somehow hypothetic yet theoretically possible in rare conditions, when one BGP protocol authors a lot of routes and the user deletes that protocol by reconfiguring in the same time as next hop update is requested, causing rte_better() to be called on a not-yet-pruned network prefix while the owner protocol has been already freed. In parallel execution environments, this would happen an inter-thread use-after-free, causing possible heisenbugs or other nasty problems. --- proto/ospf/ospf.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) (limited to 'proto/ospf/ospf.c') diff --git a/proto/ospf/ospf.c b/proto/ospf/ospf.c index 22150590..16774df6 100644 --- a/proto/ospf/ospf.c +++ b/proto/ospf/ospf.c @@ -376,8 +376,8 @@ ospf_init(struct proto_config *CF) P->reload_routes = ospf_reload_routes; P->feed_begin = ospf_feed_begin; P->feed_end = ospf_feed_end; - P->rte_better = ospf_rte_better; - P->rte_igp_metric = ospf_rte_igp_metric; + + P->sources.class = &ospf_rte_owner_class; return P; } @@ -488,7 +488,7 @@ ospf_preexport(struct channel *c, rte *e) struct ospf_area *oa = ospf_main_area(p); /* Reject our own routes */ - if (e->src->proto == c->proto) + if (e->sender == c->in_req.hook) return -1; /* Do not export routes to stub areas */ @@ -1517,6 +1517,12 @@ ospf_sh_lsadb(struct lsadb_show_data *ld) } +struct rte_owner_class ospf_rte_owner_class = { + .get_route_info = ospf_get_route_info, + .rte_better = ospf_rte_better, + .rte_igp_metric = ospf_rte_igp_metric, +}; + struct protocol proto_ospf = { .name = "OSPF", .template = "ospf%d", @@ -1532,5 +1538,4 @@ struct protocol proto_ospf = { .reconfigure = ospf_reconfigure, .get_status = ospf_get_status, .get_attr = ospf_get_attr, - .get_route_info = ospf_get_route_info }; -- cgit v1.2.3