[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@gmx.net> .

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index f3ceca3..4e73e57 100644 (file)
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -336,7 +336,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
        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)

diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 0ec1402..c6bb4c6 100644 (file)
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -282,7 +282,7 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
        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;
        }