From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Vasily Averin <vvs@virtuozzo.com>
Cc: netfilter-devel@vger.kernel.org, Florian Westphal <fw@strlen.de>,
stable@vger.kernel.org
Subject: Re: [PATCH v4.10] netfilter: nf_conntrack_h323: lost .data_len definition for Q.931/ipv6
Date: Wed, 24 Jun 2020 14:12:32 +0200 [thread overview]
Message-ID: <20200624121232.GA28150@salvia> (raw)
In-Reply-To: <c2385b5c-309c-cc64-2e10-a0ef62897502@virtuozzo.com>
CC'ing stable@vger.kernel.org
On Tue, Jun 09, 2020 at 10:53:22AM +0300, Vasily Averin wrote:
> Could you please push this patch into stable@?
> it fixes memory corruption in kernels v3.5 .. v4.10
>
> Lost .data_len definition leads to write beyond end of
> struct nf_ct_h323_master. Usually it corrupts following
> struct nf_conn_nat, however if nat is not loaded it corrupts
> following slab object.
>
> In mainline this problem went away in v4.11,
> after commit 9f0f3ebeda47 ("netfilter: helpers: remove data_len usage
> for inkernel helpers") however many stable kernels are still affected.
-stable maintainers of: 3.16, 4.4 and 4.9.
Please apply this patch, thanks.
> cc: stable@vger.kernel.org
> Fixes: 1afc56794e03 ("netfilter: nf_ct_helper: implement variable length helper private data") # v3.5
> Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
> ---
> net/netfilter/nf_conntrack_h323_main.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c
> index f65d93639d12..29fe1e7eac88 100644
> --- a/net/netfilter/nf_conntrack_h323_main.c
> +++ b/net/netfilter/nf_conntrack_h323_main.c
> @@ -1225,6 +1225,7 @@ static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
> {
> .name = "Q.931",
> .me = THIS_MODULE,
> + .data_len = sizeof(struct nf_ct_h323_master),
> .tuple.src.l3num = AF_INET6,
> .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
> .tuple.dst.protonum = IPPROTO_TCP,
> --
> 2.17.1
>
next prev parent reply other threads:[~2020-06-24 12:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-09 7:53 [PATCH v4.10] netfilter: nf_conntrack_h323: lost .data_len definition for Q.931/ipv6 Vasily Averin
2020-06-10 12:47 ` Florian Westphal
2020-06-24 12:12 ` Pablo Neira Ayuso [this message]
2020-07-07 14:03 ` Greg KH
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