diff options
Diffstat (limited to 'package/kernel/mac80211/patches/subsys/352-wifi-cfg80211-mac80211-reject-bad-MBSSID-elements.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/subsys/352-wifi-cfg80211-mac80211-reject-bad-MBSSID-elements.patch | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/subsys/352-wifi-cfg80211-mac80211-reject-bad-MBSSID-elements.patch b/package/kernel/mac80211/patches/subsys/352-wifi-cfg80211-mac80211-reject-bad-MBSSID-elements.patch new file mode 100644 index 0000000000..4c8e05e9ba --- /dev/null +++ b/package/kernel/mac80211/patches/subsys/352-wifi-cfg80211-mac80211-reject-bad-MBSSID-elements.patch @@ -0,0 +1,47 @@ +From: Johannes Berg <johannes.berg@intel.com> +Date: Wed, 28 Sep 2022 22:01:37 +0200 +Subject: [PATCH] wifi: cfg80211/mac80211: reject bad MBSSID elements + +commit 8f033d2becc24aa6bfd2a5c104407963560caabc upstream + +Per spec, the maximum value for the MaxBSSID ('n') indicator is 8, +and the minimum is 1 since a multiple BSSID set with just one BSSID +doesn't make sense (the # of BSSIDs is limited by 2^n). + +Limit this in the parsing in both cfg80211 and mac80211, rejecting +any elements with an invalid value. + +This fixes potentially bad shifts in the processing of these inside +the cfg80211_gen_new_bssid() function later. + +I found this during the investigation of CVE-2022-41674 fixed by the +previous patch. + +Fixes: 0b8fb8235be8 ("cfg80211: Parsing of Multiple BSSID information in scanning") +Fixes: 78ac51f81532 ("mac80211: support multi-bssid") +Reviewed-by: Kees Cook <keescook@chromium.org> +Signed-off-by: Johannes Berg <johannes.berg@intel.com> +--- + +--- a/net/mac80211/util.c ++++ b/net/mac80211/util.c +@@ -1413,6 +1413,8 @@ static size_t ieee802_11_find_bssid_prof + for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, start, len) { + if (elem->datalen < 2) + continue; ++ if (elem->data[0] < 1 || elem->data[0] > 8) ++ continue; + + for_each_element(sub, elem->data + 1, elem->datalen - 1) { + u8 new_bssid[ETH_ALEN]; +--- a/net/wireless/scan.c ++++ b/net/wireless/scan.c +@@ -2103,6 +2103,8 @@ static void cfg80211_parse_mbssid_data(s + for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) { + if (elem->datalen < 4) + continue; ++ if (elem->data[0] < 1 || (int)elem->data[0] > 8) ++ continue; + for_each_element(sub, elem->data + 1, elem->datalen - 1) { + u8 profile_len; + |