Re: [gentoo-amd64] Re: Re: x86_64 optimization patches for glibc.

[Ben Skeggs]

Duncan wrote:

>Brian Hall posted <20050731085600.65fc8657.brihall@××××××.net>, excerpted
>below,  on Sun, 31 Jul 2005 08:56:00 -0600:
>
>
>
>>Perhaps a USE flag could be created to enable the glibc patches, then a
>>emerge --newuse could recompile glibc and the problem apps (or
>>everything); maybe a mini-howto document would also be helpful.
>>
>>I would certainly like an easy way to enable any "free" performance
>>boost I can get!
>>
>>
>
>Something like USE=dangerous-amd64-hack? <g>
>
>(Seriously, there at least used to be a local use flag
>USE=frickin-big-security-hole, or some such, on some app I can't remember
>at the moment.  Turns out a teacher was using that app in his class as a
>an example or something, so the dev left the ability to create it there,
>but with a USE flag nobody in their right mind would normally enable.  I
>wish I could remember what it was, but grepping use.local.desc for
>anything that might be related doesn't seem to bring it up.  Perhaps the
>app, or anyway the USE flag, has now been removed from portage?)
>
>The use.local.desc description could point to the bug, which is IIRC what
>the one above did, for those wanting more information about just why such
>a USE flag exists, and just why someone might be persuaded to enable it.
>
>
>
Are you talking about GAPING_SECURITY_HOLE?  If so, this flag is still
in use by the net-analyzer/netcat package.  It enables the "-E" (iirc) 
switch
which allows you to do something like:
       nc -l -p 12345 -E /bin/bash

This(or something close to it) would cause netcat to listen on port 12345,
and forward the person who connects to it a nice bash shell.

Ben.
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