netdev - Re: [PATCH RFC net-next] net: Assert napi_gro

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150731202403.GB20471@breakpoint.cc>
Date:	Fri, 31 Jul 2015 22:24:03 +0200
From:	Florian Westphal <fw@...len.de>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	netdev@...r.kernel.org, herbert@...dor.apana.org.au,
	daniel@...earbox.net, edumazet@...gle.com, davem@...emloft.net
Subject: Re: [PATCH RFC net-next] net: Assert napi_gro_cb size against
 skb->cb[]

Florian Fainelli <f.fainelli@...il.com> wrote:
> On 64-bits hosts, napi_gro_cb is 48 bytes, which is exactly the size of
> skb->cb[], while on 32-bits hosts it is 36 bytes, but if it were to
> grow, we would not be catching a size inflation as we should.
> ---
>  net/core/dev.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 4870c3556a5a..20bc82604b75 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -4115,6 +4115,8 @@ static void skb_gro_reset_offset(struct sk_buff *skb)
>  	const struct skb_shared_info *pinfo = skb_shinfo(skb);
>  	const skb_frag_t *frag0 = &pinfo->frags[0];
>  
> +	BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct napi_gro_cb));

commit c3c7c254b2e8cd99b0adf288c2a1bddacd7ba255
already added a check for this.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html