netdev - Re: Passive OS fingerprint xtables match.

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Date:	Wed, 18 Feb 2009 16:28:58 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Patrick McHardy <kaber@...sh.net>
cc:	Evgeniy Polyakov <zbr@...emap.net>, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>
Subject: Re: Passive OS fingerprint xtables match.


On Wednesday 2009-02-18 16:00, Patrick McHardy wrote:
> Jan Engelhardt wrote:
>> On Thursday 2009-02-12 19:57, Evgeniy Polyakov wrote:
>>>> Are you sure it is safe to use arch-dependent types like 'int'?
>>> I would be very surprised if Linux will ever run on weird arch where int
>>> is not 32 bits.
>>
>> If GCC had a switch to compile with I16 or I64, I could test,
>> but it does not. 'long', as used in the netfilter includes,
>> already bit people in pre-2.6.19, and nowadays we have that compat
>> crap thing in place.. Just don't take any chance, and go the safe
>> route with uint32_t.
>
> Tons of APIs will break when the size of int changes and differs
> between userspace and kernel, this is a non-realistic risk in my
> opinion.

It is very realistic. Compilers for Microsoft DOS/Windows used to
map 'int' to a 16-bit type, and they changed that when 32-bit
became modern. Don't you think that too broke lots of stuff?
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