linux-kernel - Re: [PATCH net,v6,2/2] net/smc: initialize ipv6_pinfo_offset in smc_inet6_prot and add smc6

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Message-ID: <CAO9qdTHyj_vUEtixmpiO-VPzBUBAggx2VWjvvzjtmgs2qSGbLQ@mail.gmail.com>
Date: Tue, 20 Aug 2024 21:30:19 +0900
From: Jeongjun Park <aha310510@...il.com>
To: wenjia@...ux.ibm.com, jaka@...ux.ibm.com, alibuda@...ux.alibaba.com, 
	tonylu@...ux.alibaba.com, guwen@...ux.alibaba.com
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, 
	pabeni@...hat.com, utz.bacher@...ibm.com, dust.li@...ux.alibaba.com, 
	linux-s390@...r.kernel.org, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller <syzkaller@...glegroups.com>
Subject: Re: [PATCH net,v6,2/2] net/smc: initialize ipv6_pinfo_offset in
 smc_inet6_prot and add smc6_sock structure

Jeongjun Park wrote:
>
> Since smc_inet6_prot does not initialize ipv6_pinfo_offset, inet6_create()
> copies an incorrect address value, sk + 0 (offset), to inet_sk(sk)->pinet6.
>
> To solve this, you need to create a smc6_sock struct and add code to
> smc_inet6_prot to initialize ipv6_pinfo_offset.
>
> Reported-by: syzkaller <syzkaller@...glegroups.com>
> Fixes: d25a92ccae6b ("net/smc: Introduce IPPROTO_SMC")
> Signed-off-by: Jeongjun Park <aha310510@...il.com>
> ---
>  net/smc/smc_inet.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/net/smc/smc_inet.c b/net/smc/smc_inet.c
> index bece346dd8e9..26587a1b8c56 100644
> --- a/net/smc/smc_inet.c
> +++ b/net/smc/smc_inet.c
> @@ -60,6 +60,11 @@ static struct inet_protosw smc_inet_protosw = {
>  };
>
>  #if IS_ENABLED(CONFIG_IPV6)
> +struct smc6_sock {
> +       struct smc_sock         smc;
> +       struct ipv6_pinfo       inet6;
> +};
> +
>  static struct proto smc_inet6_prot = {
>         .name           = "INET6_SMC",
>         .owner          = THIS_MODULE,
> @@ -67,9 +72,10 @@ static struct proto smc_inet6_prot = {
>         .hash           = smc_hash_sk,
>         .unhash         = smc_unhash_sk,
>         .release_cb     = smc_release_cb,
> -       .obj_size       = sizeof(struct smc_sock),
> +       .obj_size       = sizeof(struct smc6_sock),
>         .h.smc_hash     = &smc_v6_hashinfo,
>         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
> +       .ipv6_pinfo_offset      = offsetof(struct smc6_sock, inet6);
>  };

Oh, I didn't check for typos properly. I'll fix the typos and send you
a new patch tomorrow.

>
>  static const struct proto_ops smc_inet6_stream_ops = {
> --