netdev - Re: [PATCH] ipv4: kernel panic when only one unsecured port available

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Date:	Wed, 10 Oct 2007 12:38:37 +0400
From:	"Denis V. Lunev" <den@...ru>
To:	Anton Arapov <aarapov@...hat.com>
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH] ipv4: kernel panic when only one unsecured port available

Anton Arapov wrote:
> "Denis V. Lunev" <den@...ru> writes:
>> Anton Arapov wrote: 
>>> "Denis V. Lunev" <den@...ru> writes:
>>>> This code is broken from the very beginning.
>>>>
>>>> iris den # cat /proc/sys/net/ipv4/ip_local_port_range
>>>> 32768   61000
>>>> iris den # echo 32768 32 >/proc/sys/net/ipv4/ip_local_port_range
>>>> iris den # cat /proc/sys/net/ipv4/ip_local_port_range
>>>> 32768   32
>>>> iris den # echo 32768 61000 >/proc/sys/net/ipv4/ip_local_port_range
>>>   If you're talking about checks in sysctl, I believe it should be
>>> another patch for sysctl only, and I'm going to push it via -mm tree.
>>>
>>>   the devision by zero exists in inet_connection_socket.c, and must be
>>> fixed for sure because the situation with the same min and max port
>>> numbers in sysctl are possible and not prohibited.
>>>
>>> Cheers!
>> your patch change nothing :( unfortunately. If I set '32768 32767' it
>> will oops again.
> 
>   Patch prevents the system crash. System traps on division by zero.
> 
>   Your case(MAX<MIN) must be handled by sysctl. Do you want to say
> that I have to join patch for sysctl.c to this one? It's bad idea.
> 

both versions of settings, your ones and my ones are _useless_ in real
life. So, we do some sanity fixes. Am I right? If so, we must prevent
all versions of OOPS (aka division by zero here).

I'll send my vision in a moment...

Regards,
	Den
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