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mac80211: backport security fix and disable MBSSID support

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Fixes: CVE-2022-41674
Fixes: CVE-2022-42719
Fixes: CVE-2022-42720
Fixes: CVE-2022-42721
Fixes: CVE-2022-42722
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2022-10-13 21:15:24 +02:00
parent e0bb4b7a78
commit fa9a932fdb
2 changed files with 96 additions and 0 deletions
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52
package/kernel/mac80211/patches/subsys/396-wifi-mac80211-fix-crash-in-beacon-protection-for-P2P.patch Normal file
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@ -0,0 +1,52 @@
From: Johannes Berg <johannes.berg@intel.com>
Date: Wed, 5 Oct 2022 21:24:10 +0200
Subject: [PATCH] wifi: mac80211: fix crash in beacon protection for
P2P-device
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
commit b2d03cabe2b2e150ff5a381731ea0355459be09f upstream.
If beacon protection is active but the beacon cannot be
decrypted or is otherwise malformed, we call the cfg80211
API to report this to userspace, but that uses a netdev
pointer, which isn't present for P2P-Device. Fix this to
call it only conditionally to ensure cfg80211 won't crash
in the case of P2P-Device.
This fixes CVE-2022-42722.
Reported-by: Sönke Huster <shuster@seemoo.tu-darmstadt.de>
Fixes: 9eaf183af741 ("mac80211: Report beacon protection failures to user space")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1972,10 +1972,11 @@ ieee80211_rx_h_decrypt(struct ieee80211_
if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
- NUM_DEFAULT_BEACON_KEYS) {
- cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
- skb->data,
- skb->len);
+ NUM_DEFAULT_BEACON_KEYS) {
+ if (rx->sdata->dev)
+ cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
+ skb->data,
+ skb->len);
return RX_DROP_MONITOR; /* unexpected BIP keyidx */
}
@@ -2123,7 +2124,8 @@ ieee80211_rx_h_decrypt(struct ieee80211_
/* either the frame has been decrypted or will be dropped */
status->flag |= RX_FLAG_DECRYPTED;
- if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE))
+ if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE &&
+ rx->sdata->dev))
cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
skb->data, skb->len);

44
package/kernel/mac80211/patches/subsys/397-disable-mbssid.patch Normal file
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@ -0,0 +1,44 @@
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1406,6 +1406,7 @@ static size_t ieee802_11_find_bssid_prof
if (!bss_bssid || !transmitter_bssid)
return profile_len;
+ return 0;
for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, start, len) {
if (elem->datalen < 2)
continue;
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -1982,6 +1982,7 @@ static const struct element
const struct element *next_mbssid;
const struct element *next_sub;
+ return NULL;
next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
mbssid_end,
ielen - (mbssid_end - ie));
@@ -2063,6 +2064,7 @@ static void cfg80211_parse_mbssid_data(s
u16 capability;
struct cfg80211_bss *bss;
+ return;
if (!non_tx_data)
return;
if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
@@ -2221,6 +2223,7 @@ cfg80211_update_notlisted_nontrans(struc
const struct cfg80211_bss_ies *old;
u8 cpy_len;
+ return;
lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock);
ie = mgmt->u.probe_resp.variable;
@@ -2436,6 +2439,7 @@ cfg80211_inform_bss_frame_data(struct wi
res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
len, gfp);
+ return res;
if (!res || !wiphy->support_mbssid ||
!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
return res;