The following commit has been merged in the master branch: commit 9c4604a298e0a9807eaf2cd912d1ebf24d98fbeb Author: Sven Eckelmann sven@narfation.org Date: Sun Jun 26 11:16:10 2016 +0200

batman-adv: Fix use-after-free/double-free of tt_req_node

The tt_req_node is added and removed from a list inside a spinlock. But the locking is sometimes removed even when the object is still referenced and will be used later via this reference. For example batadv_send_tt_request can create a new tt_req_node (including add to a list) and later re-acquires the lock to remove it from the list and to free it. But at this time another context could have already removed this tt_req_node from the list and freed it.

CPU#0

batadv_batman_skb_recv from net_device 0 -> batadv_iv_ogm_receive -> batadv_iv_ogm_process -> batadv_iv_ogm_process_per_outif -> batadv_tvlv_ogm_receive -> batadv_tvlv_ogm_receive -> batadv_tvlv_containers_process -> batadv_tvlv_call_handler -> batadv_tt_tvlv_ogm_handler_v1 -> batadv_tt_update_orig -> batadv_send_tt_request -> batadv_tt_req_node_new spin_lock(...) allocates new tt_req_node and adds it to list spin_unlock(...) return tt_req_node

CPU#1

batadv_batman_skb_recv from net_device 1 -> batadv_recv_unicast_tvlv -> batadv_tvlv_containers_process -> batadv_tvlv_call_handler -> batadv_tt_tvlv_unicast_handler_v1 -> batadv_handle_tt_response spin_lock(...) tt_req_node gets removed from list and is freed spin_unlock(...)

CPU#0

<- returned to batadv_send_tt_request spin_lock(...) tt_req_node gets removed from list and is freed MEMORY CORRUPTION/SEGFAULT/... spin_unlock(...)

This can only be solved via reference counting to allow multiple contexts to handle the list manipulation while making sure that only the last context holding a reference will free the object.

Fixes: a73105b8d4c7 ("batman-adv: improved client announcement mechanism") Signed-off-by: Sven Eckelmann sven@narfation.org Tested-by: Martin Weinelt martin@darmstadt.freifunk.net Tested-by: Amadeus Alfa amadeus@chemnitz.freifunk.net Signed-off-by: Marek Lindner mareklindner@neomailbox.ch Signed-off-by: David S. Miller davem@davemloft.net

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 72abab7..cfb5ccd 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -2271,6 +2271,29 @@ static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv, return crc; }

+/** + * batadv_tt_req_node_release - free tt_req node entry + * @ref: kref pointer of the tt req_node entry + */ +static void batadv_tt_req_node_release(struct kref *ref) +{ + struct batadv_tt_req_node *tt_req_node; + + tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount); + + kfree(tt_req_node); +} + +/** + * batadv_tt_req_node_put - decrement the tt_req_node refcounter and + * possibly release it + * @tt_req_node: tt_req_node to be free'd + */ +static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node) +{ + kref_put(&tt_req_node->refcount, batadv_tt_req_node_release); +} + static void batadv_tt_req_list_free(struct batadv_priv *bat_priv) { struct batadv_tt_req_node *node; @@ -2280,7 +2303,7 @@ static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)

hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { hlist_del_init(&node->list); - kfree(node); + batadv_tt_req_node_put(node); }

spin_unlock_bh(&bat_priv->tt.req_list_lock); @@ -2317,7 +2340,7 @@ static void batadv_tt_req_purge(struct batadv_priv *bat_priv) if (batadv_has_timed_out(node->issued_at, BATADV_TT_REQUEST_TIMEOUT)) { hlist_del_init(&node->list); - kfree(node); + batadv_tt_req_node_put(node); } } spin_unlock_bh(&bat_priv->tt.req_list_lock); @@ -2349,9 +2372,11 @@ batadv_tt_req_node_new(struct batadv_priv *bat_priv, if (!tt_req_node) goto unlock;

+ kref_init(&tt_req_node->refcount); ether_addr_copy(tt_req_node->addr, orig_node->orig); tt_req_node->issued_at = jiffies;

+ kref_get(&tt_req_node->refcount); hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list); unlock: spin_unlock_bh(&bat_priv->tt.req_list_lock); @@ -2615,13 +2640,19 @@ static bool batadv_send_tt_request(struct batadv_priv *bat_priv, out: if (primary_if) batadv_hardif_put(primary_if); + if (ret && tt_req_node) { spin_lock_bh(&bat_priv->tt.req_list_lock); - /* hlist_del_init() verifies tt_req_node still is in the list */ - hlist_del_init(&tt_req_node->list); + if (!hlist_unhashed(&tt_req_node->list)) { + hlist_del_init(&tt_req_node->list); + batadv_tt_req_node_put(tt_req_node); + } spin_unlock_bh(&bat_priv->tt.req_list_lock); - kfree(tt_req_node); } + + if (tt_req_node) + batadv_tt_req_node_put(tt_req_node); + kfree(tvlv_tt_data); return ret; } @@ -3057,7 +3088,7 @@ static void batadv_handle_tt_response(struct batadv_priv *bat_priv, if (!batadv_compare_eth(node->addr, resp_src)) continue; hlist_del_init(&node->list); - kfree(node); + batadv_tt_req_node_put(node); }

spin_unlock_bh(&bat_priv->tt.req_list_lock); diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 6a577f4..ba846b0 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -1137,11 +1137,13 @@ struct batadv_tt_change_node { * struct batadv_tt_req_node - data to keep track of the tt requests in flight * @addr: mac address address of the originator this request was sent to * @issued_at: timestamp used for purging stale tt requests + * @refcount: number of contexts the object is used by * @list: list node for batadv_priv_tt::req_list */ struct batadv_tt_req_node { u8 addr[ETH_ALEN]; unsigned long issued_at; + struct kref refcount; struct hlist_node list; };