Re: [PATCH] x86/dumpstack/64: Don't evaluate exception stacks before setup

[Thomas Gleixner]

On Wed, 23 Oct 2019, Matthew Wilcox wrote:

> On Wed, Oct 23, 2019 at 08:05:49PM +0200, Thomas Gleixner wrote:
> > Prevent this by checking the validity of the cea_exception_stack base
> > address and bailing out if it is zero.
> 
> Could also initialise cea_exception_stack to -1?  That would lead to it
> being caught by ...
> 
> >  	end = begin + sizeof(struct cea_exception_stacks);
> >  	/* Bail if @stack is outside the exception stack area. */
> >  	if (stk < begin || stk >= end)
> 
> this existing check.

Yes thought about that, but then decided to do it in a readable way :)