Re: [PATCH] x86 page fault handler not interrupt safe

[Alan Cox]

> Alan Cox wrote:
> > (The current -ac fix for the double vmalloc races is below. WP test makes it
> > more complex than is nice)
> 
> WP test is easy to handle.  Just filter out protection violations and
> only take the vmalloc path if the page was not found.
> 
> -       if (address >= TASK_SIZE && !(error_code & 4))
> +       if (address >= TASK_SIZE && !(error_code & 5))

That is nice. I hadn't thought about doing it that way. It still has the problem
if %cr2 is corrupted by a vmalloc fault but it cleans up my other code paths
nicely.

Thanks

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