linux-kernel - [PATCH] prevent rtl8192su from crashing dev

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090624193439.GA23924@localhost>
Date:	Wed, 24 Jun 2009 22:34:39 +0300
From:	Dan Aloni <dan@...ni.org>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Linux Kernel List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH] prevent rtl8192su from crashing dev_ioctl in SIOCGIWNAME

(adapted from the rtl8187se patch)

ieee80211_wx_get_name() ignores sizeof(wrqu->name) which is IFNAMSIZ (16), and
on certain conditions, the concatenated string will be larger than IFNAMSIZ
including the terminating zero.

    length ("802.11" ++ "b" ++ "/g" ++ " linked" ++ "\x00") == 17

This fix uses strl{cpy,cat} in addition to the reduction of the total
possible length of the output string by a char.

It can be applied to 2.6.30-stable as well.

Signed-off-by: Dan Aloni <dan@...ni.org>
---
 .../rtl8192su/ieee80211/ieee80211_softmac_wx.c     |   14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/rtl8192su/ieee80211/ieee80211_softmac_wx.c b/drivers/staging/rtl8192su/ieee80211/ieee80211_softmac_wx.c
index 1f50c46..b93ddc9 100644
--- a/drivers/staging/rtl8192su/ieee80211/ieee80211_softmac_wx.c
+++ b/drivers/staging/rtl8192su/ieee80211/ieee80211_softmac_wx.c
@@ -548,21 +548,21 @@ int ieee80211_wx_get_name(struct ieee80211_device *ieee,
 			     struct iw_request_info *info,
 			     union iwreq_data *wrqu, char *extra)
 {
-	strcpy(wrqu->name, "802.11");
+	strlcpy(wrqu->name, "802.11", IFNAMSIZ);
 	if(ieee->modulation & IEEE80211_CCK_MODULATION){
-		strcat(wrqu->name, "b");
+		strlcat(wrqu->name, "b", IFNAMSIZ);
 		if(ieee->modulation & IEEE80211_OFDM_MODULATION)
-			strcat(wrqu->name, "/g");
+			strlcat(wrqu->name, "/g", IFNAMSIZ);
 	}else if(ieee->modulation & IEEE80211_OFDM_MODULATION)
-		strcat(wrqu->name, "g");
+		strlcat(wrqu->name, "g", IFNAMSIZ);
 	if (ieee->mode & (IEEE_N_24G | IEEE_N_5G))
-		strcat(wrqu->name, "/n");
+		strlcat(wrqu->name, "/n", IFNAMSIZ);
 
 	if((ieee->state == IEEE80211_LINKED) ||
 		(ieee->state == IEEE80211_LINKED_SCANNING))
-		strcat(wrqu->name," linked");
+		strlcat(wrqu->name,"  link", IFNAMSIZ);
 	else if(ieee->state != IEEE80211_NOLINK)
-		strcat(wrqu->name," link..");
+		strlcat(wrqu->name," .....", IFNAMSIZ);
 
 
 	return 0;
-- 
1.6.0.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/