linux-kernel - Re: [RFC PATCH] x86: Make sure verify

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Date:	Thu, 3 Mar 2016 13:22:59 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Brian Gerst <brgerst@...il.com>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [RFC PATCH] x86: Make sure verify_cpu has a good stack

On 03/03/16 12:54, Borislav Petkov wrote:
> On Thu, Mar 03, 2016 at 12:22:06PM -0800, H. Peter Anvin wrote:
>> The only thing I can think of is that the -8 creates a null pointer that
>> terminates a stack trace.
> 
> Probably not needed anymore as print_context_stack()->valid_stack_ptr()
> in dumpstack.c look at the stack boundaries instead of checking for
> NULL...
> 

Sure, but it could still affect kgdb or what not.  That's the only
reason I can see for -8 though.

	-hpa