From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Chen Gang , Pablo Neira Ayuso , Luis Henriques Subject: [PATCH 072/145] netfilter: ipt_ULOG: fix non-null terminated string in the nf_log path Date: Wed, 17 Jul 2013 15:46:44 -0700 Message-Id: <1374101277-7915-73-git-send-email-kamal@canonical.com> In-Reply-To: <1374101277-7915-1-git-send-email-kamal@canonical.com> References: <1374101277-7915-1-git-send-email-kamal@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.8.13.5 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Chen Gang commit 4f36ea6eed2081340c7a7aa98c73187ecfccebff upstream. If nf_log uses ipt_ULOG as logging output, we can deliver non-null terminated strings to user-space since the maximum length of the prefix that is passed by nf_log is NF_LOG_PREFIXLEN but pm->prefix is 32 bytes long (ULOG_PREFIX_LEN). This is actually happening already from nf_conntrack_tcp if ipt_ULOG is used, since it is passing strings longer than 32 bytes. Signed-off-by: Chen Gang Signed-off-by: Pablo Neira Ayuso Signed-off-by: Luis Henriques --- net/ipv4/netfilter/ipt_ULOG.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c index b5ef3cb..db5f368 100644 --- a/net/ipv4/netfilter/ipt_ULOG.c +++ b/net/ipv4/netfilter/ipt_ULOG.c @@ -217,8 +217,10 @@ static void ipt_ulog_packet(unsigned int hooknum, put_unaligned(tv.tv_usec, &pm->timestamp_usec); put_unaligned(skb->mark, &pm->mark); pm->hook = hooknum; - if (prefix != NULL) - strncpy(pm->prefix, prefix, sizeof(pm->prefix)); + if (prefix != NULL) { + strncpy(pm->prefix, prefix, sizeof(pm->prefix) - 1); + pm->prefix[sizeof(pm->prefix) - 1] = '\0'; + } else if (loginfo->prefix[0] != '\0') strncpy(pm->prefix, loginfo->prefix, sizeof(pm->prefix)); else -- 1.8.1.2