From: Florian Westphal <fw@strlen.de>
To: netfilter-devel <netfilter-devel@vger.kernel.org>
Cc: netdev <netdev@vger.kernel.org>, Florian Westphal <fw@strlen.de>
Subject: [PATCH 1/1] netfilter: cttimeout: fix buffer overflow
Date: Wed, 21 Nov 2012 12:37:38 +0100 [thread overview]
Message-ID: <1353497858-29404-1-git-send-email-fw@strlen.de> (raw)
Chen Gang reports:
the length of nla_data(cda[CTA_TIMEOUT_NAME]) is not limited in server side.
And indeed, its used to strcpy to a fixed-sized buffer.
Fortunately, nfnetlink users need CAP_NET_ADMIN.
Reported-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
---
net/netfilter/nfnetlink_cttimeout.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c
index 8847b4d..701c88a 100644
--- a/net/netfilter/nfnetlink_cttimeout.c
+++ b/net/netfilter/nfnetlink_cttimeout.c
@@ -41,7 +41,8 @@ MODULE_DESCRIPTION("cttimeout: Extended Netfilter Connection Tracking timeout tu
static LIST_HEAD(cttimeout_list);
static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = {
- [CTA_TIMEOUT_NAME] = { .type = NLA_NUL_STRING },
+ [CTA_TIMEOUT_NAME] = { .type = NLA_NUL_STRING,
+ .len = CTNL_TIMEOUT_NAME_MAX - 1},
[CTA_TIMEOUT_L3PROTO] = { .type = NLA_U16 },
[CTA_TIMEOUT_L4PROTO] = { .type = NLA_U8 },
[CTA_TIMEOUT_DATA] = { .type = NLA_NESTED },
--
1.7.8.6
next reply other threads:[~2012-11-21 11:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-21 11:37 Florian Westphal [this message]
2012-11-21 22:54 ` [PATCH 1/1] netfilter: cttimeout: fix buffer overflow Pablo Neira Ayuso
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