[PATCH] ARM: add warning for invalid kernel page faults
Imre Deak
imre.deak at nokia.com
Mon Sep 28 07:33:27 EDT 2009
On Mon, Sep 28, 2009 at 01:26:24PM +0200, ext Russell King - ARM Linux wrote:
> On Mon, Sep 28, 2009 at 02:01:58PM +0300, Imre Deak wrote:
> > On Mon, Sep 28, 2009 at 12:27:10PM +0200, ext Russell King - ARM Linux wrote:
> > > [...]
> > >
> > > Now you're talking about different code - the bit I quoted was what was
> > > in your submitted patch, without deletion of intervening lines. There
> > > was no else clause in your patch.
> > >
> > > Please, go back and look at your original patch.
> >
> > Ah, sorry. Missed that line when rebasing. I'll send an updated one.
>
> Now I see what you're getting at. Yes, we can make this a debugging
> option, but I believe it should exhibit the right behaviour.
>
> In other words (and as I already covered) it should invoke the standard
> no_context thing if there isn't a fixup handler in place rather than
> continuing blindly on to try to handle the fault. So, it should be:
>
> if (!down_read_trylock(&mm->mmap_sem)) {
> if (!user_mode(regs) && !search_exception_tables(regs->ARM_pc))
> goto no_context;
> down_read(&mm->mmap_sem);
> } else {
> +#ifdef CONFIG_DEBUG_VM
> + if (!user_mode(regs) && !search_exception_tables(regs->ARM_pc))
> + goto no_context;
> +#endif
Ok, agreed. Do you need an updated patch?
--Imre
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