Re: [patch 06/11] Text Edit Lock - Alternative code for x86

[Mathieu Desnoyers]

* pageexec@xxxxxxxxxxx (pageexec@xxxxxxxxxxx) wrote:
> On 5 Dec 2007 at 21:02, Mathieu Desnoyers wrote:
> 
> > Fix a memcpy that should be a text_poke (in apply_alternatives).
> > 
> > Use kernel_wp_save/kernel_wp_restore in text_poke to support DEBUG_RODATA
> > correctly and so the CPU HOTPLUG special case can be removed.
> > 
> > Add text_poke_early, for alternatives and paravirt boot-time and module load
> > time patching.
> > 
> > Notes:
> > - we use a macro for kernel_wp_save/restore to mimic local_irq_save/restore: the
> >   argument is passed without &.
> 
> sorry to chime in again, but lately i've been thinking that the
> cr0 argument is not really needed if one can ensure that calls
> to the kernel open/close macros won't nest (i checked and even
> in the PaX case it's easy to ensure, even desirable in fact).
> 
> in your case it's also true for now and i can't think of a situation
> where you'd really want to nest in the future (that'd mean opening
> up the kernel while some complex piece of code runs, more complex
> than a mere memset at least ;-). what do you think?
> 

Yes, your proposal makes sense. I'll do the changes.

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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