linux-kernel - Re: [PATCH] net: fix bridge multicast packet checksum validation

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]

Date:	Thu, 18 Feb 2016 15:35:42 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	linus.luessing@...3.blue
Cc:	netdev@...r.kernel.org, stephen@...workplumber.org,
	bridge@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	sgunderson@...foot.com, noltari@...il.com, tom@...bertland.com
Subject: Re: [PATCH] net: fix bridge multicast packet checksum validation

From: Linus Lüssing <linus.luessing@...3.blue>
Date: Mon, 15 Feb 2016 03:07:06 +0100

> @@ -4084,10 +4089,22 @@ struct sk_buff *skb_checksum_trimmed(struct sk_buff *skb,
>  	if (!pskb_may_pull(skb_chk, offset))
>  		goto err;
>  
> -	__skb_pull(skb_chk, offset);
> +	ip_summed = skb->ip_summed;
> +	csum_valid = skb->csum_valid;
> +	csum_level = skb->csum_level;
> +	csum_bad = skb->csum_bad;
> +	csum = skb->csum;
> +
> +	skb_pull_rcsum(skb_chk, offset);
>  	ret = skb_chkf(skb_chk);
>  	__skb_push(skb_chk, offset);
>  
> +	skb->ip_summed = ip_summed;
> +	skb->csum_valid = csum_valid;
> +	skb->csum_level = csum_level;
> +	skb->csum_bad = csum_bad;
> +	skb->csum = csum;
> +

There really has to be a better way to fix this :-/