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netfilter: ebt_ulog: fix info leaks 

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 <minipli@googlemail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Mathias Krause 2013-09-30 22:05:07 +02:00 committed by Pablo Neira Ayuso
parent c31eeaced2
commit ca0a10672d
1 changed files with 3 additions and 6 deletions
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9
net/bridge/netfilter/ebt_ulog.c
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@ -181,6 +181,7 @@ static void ebt_ulog_packet(struct net *net, unsigned int hooknr,
ub->qlen++;
pm = nlmsg_data(nlh);
memset(pm, 0, sizeof(*pm));
/* Fill in the ulog data */
pm->version = EBT_ULOG_VERSION;
@ -193,8 +194,6 @@ static void ebt_ulog_packet(struct net *net, unsigned int hooknr,
pm->hook = hooknr;
if (uloginfo->prefix != NULL)
strcpy(pm->prefix, uloginfo->prefix);
else
*(pm->prefix) = '\0';
if (in) {
strcpy(pm->physindev, in->name);
@ -204,16 +203,14 @@ static void ebt_ulog_packet(struct net *net, unsigned int hooknr,
strcpy(pm->indev, br_port_get_rcu(in)->br->dev->name);
else
strcpy(pm->indev, in->name);
} else
pm->indev[0] = pm->physindev[0] = '\0';
}
if (out) {
/* If out exists, then out is a bridge port */
strcpy(pm->physoutdev, out->name);
/* rcu_read_lock()ed by nf_hook_slow */
strcpy(pm->outdev, br_port_get_rcu(out)->br->dev->name);
} else
pm->outdev[0] = pm->physoutdev[0] = '\0';
}
if (skb_copy_bits(skb, -ETH_HLEN, pm->data, copy_len) < 0)
BUG();