diff options
| author | Chen Gang <gang.chen@asianux.com> | 2013-05-23 01:50:46 +0000 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-05-23 14:25:40 +0200 |
| commit | 4f36ea6eed2081340c7a7aa98c73187ecfccebff (patch) | |
| tree | 295b214d5b19811ae7ffe450402af412daf109c8 /net/ipv4 | |
| parent | 2a7851bffb008ff4882eee673da74718997b4265 (diff) | |
| download | linux-4f36ea6eed2081340c7a7aa98c73187ecfccebff.tar.gz linux-4f36ea6eed2081340c7a7aa98c73187ecfccebff.tar.xz | |
netfilter: ipt_ULOG: fix non-null terminated string in the nf_log path
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 <gang.chen@asianux.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/netfilter/ipt_ULOG.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c index cf08218ddbcf..ff4b781b1056 100644 --- a/net/ipv4/netfilter/ipt_ULOG.c +++ b/net/ipv4/netfilter/ipt_ULOG.c @@ -231,8 +231,10 @@ static void ipt_ulog_packet(struct net *net, 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 |