| 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
| ||
|
Date: Thu, 27 Mar 2008 23:58:42 +0100
From: Thomas Graf <tgraf@...g.ch>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org
Subject: [ESP]: Ensure IV is in linear part of the skb to avoid BUG() due to OOB access
ESP does not account for the IV size when calling pskb_may_pull() to
ensure everything it accesses directly is within the linear part of a
potential fragment. This results in a BUG() being triggered when the
both the IPv4 and IPv6 ESP stack is fed with an skb where the first
fragment ends between the end of the esp header and the end of the IV.
This bug was found by Dirk Nehring <dnehring@....net> .
Signed-off-by: Thomas Graf <tgraf@...g.ch>
Index: net-2.6/net/ipv4/esp4.c
===================================================================
--- net-2.6.orig/net/ipv4/esp4.c 2008-03-27 23:47:48.000000000 +0100
+++ net-2.6/net/ipv4/esp4.c 2008-03-27 23:47:58.000000000 +0100
@@ -336,7 +336,7 @@
struct scatterlist *asg;
int err = -EINVAL;
- if (!pskb_may_pull(skb, sizeof(*esph)))
+ if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
goto out;
if (elen <= 0)
Index: net-2.6/net/ipv6/esp6.c
===================================================================
--- net-2.6.orig/net/ipv6/esp6.c 2008-03-27 23:47:48.000000000 +0100
+++ net-2.6/net/ipv6/esp6.c 2008-03-27 23:47:58.000000000 +0100
@@ -282,7 +282,7 @@
struct scatterlist *sg;
struct scatterlist *asg;
- if (!pskb_may_pull(skb, sizeof(*esph))) {
+ if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) {
ret = -EINVAL;
goto out;
}
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists