Re: [uml-devel] Testing requested - [PATCH] Fixing SKAS0 compilation problem / TT mode bug report

[Blaisorblade <blaisorblade@yahoo.it>]

On Tuesday 29 November 2005 18:55, Jeff Dike wrote:
> On Tue, Nov 29, 2005 at 05:28:56PM +0100, Blaisorblade wrote:
> > So, again: can we finally rewrite clone.c in assembly? Or, otherwise, to
> > use a unique assembly macro joining mmap, the return and trap_myself?
>
> I would favor the second, although I would just join the mmap and storing
> of the error value.
I want to add the int3 too - that's the only way to be deterministically sure 
that GCC doesn't use %ebp after the unmap.

> The stack switching is at the heart of our recent 
> problems here, so some asm which hides that should be OK.  I think the rest
> is OK with the pseudo-C, right?
Yes, mostly.... there is also the problem with hardened toolchains (two 
different reports), which makes inline syscalls bleach (hardened toolchains 
use PIE code and need to have %EBX reserved for GOT/PLT handling), but I 
currently I do not consider fixing it before I can reproduce it.
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade


		
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