Re: New struct sock_common breaks parisc 64 bit compiles with a misalignment

From: Andi Kleen (
Date: Sun Jun 15 2003 - 10:41:53 EST

"David S. Miller" <> writes:

> From: James Bottomley <>
> Date: 15 Jun 2003 10:17:10 -0500
> It's not necessary and would, indeed, be detrimental to operation since
> we'd generate alignment traps on almost every encapsulated protocol (at
> several hundred instructions per trap). If we do this, our network
> performance will tank.
> It doesn't happen for all the normal cases, but it does for
> things like IP in appletalk and stuff like that.

It can be remotely triggered in ordinary TCP. Just add an odd number of nops
before a TCP timestamp to misalign it.

In short any linux parisc64 box on the net is very likely remotely

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