FreeBSD entry on Wikipedia

Vadim Goncharov vadim_nuclight at
Wed Jun 22 22:22:59 GMT 2005

Hello Andy,

Thursday, June 23, 2005, 4:24:36 AM, you wrote:

>>>> IMHO, if they can roll out a patch to a major security flaw in a
>>>> day, they should have been able to fix the uptime clock at some
>>>> point in the last decade. Odd that MS can do something that Linux
>>>> can't.
>> AG> This was fixed about 3 years ago.
>> Sure? So why Netcraft states about it aven nowadays? Even more, it
>> says
>> that some versions of FreeBSD (newer, as I understood) also wrap that
>> uptime counter?
AG> Linux used to wrap at 497 days, but there were a few changes in 2.5.x to
AG> change the counters to 64-bit. -- In theory 2.6.x should be fine.
AG> I'm not 100% sure when or if this was backported to a 2.4 kernel
AG> release,
AG> but the patches have been around since early 2002.  (around 2.4.19)
AG> --
AG> As for why Netcraft is reporting it... I guess it's probably safe enough
AG> to say that "most" linux machines will wrap at 497 days, as not everyone
AG> patches or upgrades their kernel.

I've not understood. AFAIR, Netcraft says that it was broken somewhere
in 2.5, and it began to wrap again. Moreover, it would be great if you
could tell method how Netcraft is determining uptime remotely - they
changed counters to 64bit, and what?.. Where it is in TCP/IP stack? And
where that stuff in FreeBSD ?

AG> On a more personal note, I don't believe having a long uptime is always
AG> a good thing...

Certainly, not always, but mostly. Although it's main function - to make
impression. Top 50 is very impressive about BSD, isn't it? :)

AG> If there are indeed Linux machines with uptimes of over
AG> 1000 days, they are no doubt full of security holes, but this applies
AG> equally to any OS.

Not equally. Are the BSD machines in Top 50 really vulnerable to remote
code execution attacks?..

AG> And yes, nearly all my machines are FreeBSD, before anyone asks ;)


Best regards,
 Vadim Goncharov   ICQ UIN 166852181   mailto:vadim_nuclight at

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