mac80211: properly handle A-MSDUs that start with an RFC 1042 header

Properly parse A-MSDUs whose first 6 bytes happen to equal a rfc1042
header. This can occur in practice when the destination MAC address
equals AA:AA:03:00:00:00. More importantly, this simplifies the next
patch to mitigate A-MSDU injection attacks.

Cc: stable@vger.kernel.org
Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@kuleuven.be>
Link: https://lore.kernel.org/r/20210511200110.0b2b886492f0.I23dd5d685fe16d3b0ec8106e8f01b59f499dffed@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 5224f885a99a129856f486249d9a77390ce87d9c..58c2cd417e89ae469a7f46b0e93ce4b1a17c822a 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -5760,7 +5760,7 @@ unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr);
  */
 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
                                  const u8 *addr, enum nl80211_iftype iftype,
-                                 u8 data_offset);
+                                 u8 data_offset, bool is_amsdu);
 
 /**
  * ieee80211_data_to_8023 - convert an 802.11 data frame to 802.3
@@ -5772,7 +5772,7 @@ int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
 static inline int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
                                         enum nl80211_iftype iftype)
 {
-       return ieee80211_data_to_8023_exthdr(skb, NULL, addr, iftype, 0);
+       return ieee80211_data_to_8023_exthdr(skb, NULL, addr, iftype, 0, false);
 }
 
 /**

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 531232b91bc49c3e71dfab3020e9e04935d091f4..f14d32a5001dd14537db37485d8c5165c99d5277 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2682,7 +2682,7 @@ __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
        if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
                                          rx->sdata->vif.addr,
                                          rx->sdata->vif.type,
-                                         data_offset))
+                                         data_offset, true))
                return RX_DROP_UNUSABLE;
 
        ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 382c5262d997dd7c439b11382ab3846e941c9400..39966a873e4015677b6d224b4dbd225f41adff46 100644 (file)
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -542,7 +542,7 @@ EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 
 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
                                  const u8 *addr, enum nl80211_iftype iftype,
-                                 u8 data_offset)
+                                 u8 data_offset, bool is_amsdu)
 {
        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
        struct {
@@ -629,7 +629,7 @@ int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
        skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
        tmp.h_proto = payload.proto;
 
-       if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
+       if (likely((!is_amsdu && ether_addr_equal(payload.hdr, rfc1042_header) &&
                    tmp.h_proto != htons(ETH_P_AARP) &&
                    tmp.h_proto != htons(ETH_P_IPX)) ||
                   ether_addr_equal(payload.hdr, bridge_tunnel_header)))