netdev - Re: sparc oops in ip_fast

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Message-ID: <20080105094400.GH27894@ZenIV.linux.org.uk>
Date:	Sat, 5 Jan 2008 09:44:00 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Mariusz Kozlowski <m.kozlowski@...land.pl>
Cc:	David Miller <davem@...emloft.net>, sparclinux@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: sparc oops in ip_fast_csum

On Fri, Jan 04, 2008 at 06:37:36PM +0100, Mariusz Kozlowski wrote:
> Hello,
> 
>         This comes from the Linus latest linux-2.6 tree. Randomly happened.
> Can't reproduce that. More info below.

ip_fast_csum() called from raw_send_hdrinc() from raw_sendmsg() ran through
the page boundary into unmapped page...  Bloody odd, that, seeing that
we have checked iph->ihl * 4U <= length and had done
        err = memcpy_fromiovecend((void *)iph, from, 0, length);
before the
                iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
that had triggered that crap..
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