From 3ca696839223ed38faeaf9b215b35c91ef6a5811 Mon Sep 17 00:00:00 2001 From: Mathias Krause Date: Mon, 30 Sep 2013 22:05:08 +0200 Subject: [PATCH] netfilter: ipt_ULOG: fix info leaks commit 278f2b3e2af5f32ea1afe34fa12a2518153e6e49 upstream. The ulog messages leak heap bytes by the means of padding bytes and incompletely filled string arrays. Fix those by memset(0)'ing the whole struct before filling it. Signed-off-by: Mathias Krause Signed-off-by: Pablo Neira Ayuso Cc: Jan Tore Morken Signed-off-by: Greg Kroah-Hartman --- net/ipv4/netfilter/ipt_ULOG.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c index 32b0e978c8e0..f8629c04f35b 100644 --- a/net/ipv4/netfilter/ipt_ULOG.c +++ b/net/ipv4/netfilter/ipt_ULOG.c @@ -220,6 +220,7 @@ static void ipt_ulog_packet(struct net *net, ub->qlen++; pm = nlmsg_data(nlh); + memset(pm, 0, sizeof(*pm)); /* We might not have a timestamp, get one */ if (skb->tstamp.tv64 == 0) @@ -238,8 +239,6 @@ static void ipt_ulog_packet(struct net *net, } else if (loginfo->prefix[0] != '\0') strncpy(pm->prefix, loginfo->prefix, sizeof(pm->prefix)); - else - *(pm->prefix) = '\0'; if (in && in->hard_header_len > 0 && skb->mac_header != skb->network_header && @@ -251,13 +250,9 @@ static void ipt_ulog_packet(struct net *net, if (in) strncpy(pm->indev_name, in->name, sizeof(pm->indev_name)); - else - pm->indev_name[0] = '\0'; if (out) strncpy(pm->outdev_name, out->name, sizeof(pm->outdev_name)); - else - pm->outdev_name[0] = '\0'; /* copy_len <= skb->len, so can't fail. */ if (skb_copy_bits(skb, 0, pm->payload, copy_len) < 0) -- 2.34.1