netdev - Re: [PATCH] cls_u32: use skb_copy_bits() to dereference data safely

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:	Wed, 02 Jun 2010 06:43:16 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hadi@...erus.ca
Cc:	xiaosuo@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] cls_u32: use skb_copy_bits() to dereference data safely

From: jamal <hadi@...erus.ca>
Date: Wed, 02 Jun 2010 09:36:37 -0400

> On Wed, 2010-06-02 at 21:14 +0800, Changli Gao wrote:
> 
> 
>> Maybe skb_header_pointer() is lighter.
> 
> A little worse than skb_copy_bits(). In any case, this change is going
> to hurt.

Umm, Jamal what are you talking about?

Using skb_header_pointer(), if the offset is in range, there is no
change from today other than a comparison.

If it is not in range, we use skb_copy_bits().  It's only for the
case where we have to fetch the value from the fragmented part
of the SKB.
--
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