[backport request] netfilter: ipt_ULOG: fix info leaks
From: Jan Tore Morken <hidden>
Date: 2014-07-01 18:39:48
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Hi, I mistakenly sent this request to the stable list before being made aware that it belonged here. Sorry to anyone reading this for the second time. I'd like to request that the commit below is backported to stable. The commit fixes an old memory disclosure issue, and has already spent some time in mainline. Thanks! ===
From 278f2b3e2af5f32ea1afe34fa12a2518153e6e49 Mon Sep 17 00:00:00 2001
From: Mathias Krause <redacted> Date: Mon, 30 Sep 2013 22:05:08 +0200 Subject: [PATCH] netfilter: ipt_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 <redacted> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> --- 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 cbc2215..9cb993c 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)
--
2.0.0