This is a note to let you know that I've just added the patch titled
cfg80211: Check if PMKID attribute is of expected size
to the 4.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cfg80211-check-if-pmkid-attribute-is-of-expected-size.patch
and it can be found in the queue-4.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9361df14d1cbf966409d5d6f48bb334384fbe138 Mon Sep 17 00:00:00 2001
From: Srinivas Dasari <dasaris@xxxxxxxxxxxxxxxx>
Date: Fri, 7 Jul 2017 01:43:39 +0300
Subject: cfg80211: Check if PMKID attribute is of expected size
From: Srinivas Dasari <dasaris@xxxxxxxxxxxxxxxx>
commit 9361df14d1cbf966409d5d6f48bb334384fbe138 upstream.
nla policy checks for only maximum length of the attribute data
when the attribute type is NLA_BINARY. If userspace sends less
data than specified, the wireless drivers may access illegal
memory. When type is NLA_UNSPEC, nla policy check ensures that
userspace sends minimum specified length number of bytes.
Remove type assignment to NLA_BINARY from nla_policy of
NL80211_ATTR_PMKID to make this NLA_UNSPEC and to make sure minimum
WLAN_PMKID_LEN bytes are received from userspace with
NL80211_ATTR_PMKID.
Fixes: 67fbb16be69d ("nl80211: PMKSA caching support")
Signed-off-by: Srinivas Dasari <dasaris@xxxxxxxxxxxxxxxx>
Signed-off-by: Jouni Malinen <jouni@xxxxxxxxxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/wireless/nl80211.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -291,8 +291,7 @@ static const struct nla_policy nl80211_p
[NL80211_ATTR_WPA_VERSIONS] = { .type = NLA_U32 },
[NL80211_ATTR_PID] = { .type = NLA_U32 },
[NL80211_ATTR_4ADDR] = { .type = NLA_U8 },
- [NL80211_ATTR_PMKID] = { .type = NLA_BINARY,
- .len = WLAN_PMKID_LEN },
+ [NL80211_ATTR_PMKID] = { .len = WLAN_PMKID_LEN },
[NL80211_ATTR_DURATION] = { .type = NLA_U32 },
[NL80211_ATTR_COOKIE] = { .type = NLA_U64 },
[NL80211_ATTR_TX_RATES] = { .type = NLA_NESTED },
Patches currently in stable-queue which might be from dasaris@xxxxxxxxxxxxxxxx are
queue-4.12/cfg80211-validate-frequencies-nested-in-nl80211_attr_scan_frequencies.patch
queue-4.12/cfg80211-check-if-pmkid-attribute-is-of-expected-size.patch
queue-4.12/cfg80211-define-nla_policy-for-nl80211_attr_local_mesh_power_mode.patch
queue-4.12/cfg80211-check-if-nan-service-id-is-of-expected-size.patch