linux-kernel - Re: [PATCH] vmcore: prevent PT_NOTE p_memsz overflow during header update

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Message-Id: <20140131181254.da3f8e97.akpm@linux-foundation.org>
Date:	Fri, 31 Jan 2014 18:12:54 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Pearson, Greg" <greg.pearson@...com>
Cc:	"vgoyal@...hat.com" <vgoyal@...hat.com>,
	"d.hatayama@...fujitsu.com" <d.hatayama@...fujitsu.com>,
	"holzheu@...ux.vnet.ibm.com" <holzheu@...ux.vnet.ibm.com>,
	"dhowells@...hat.com" <dhowells@...hat.com>,
	"paul.gortmaker@...driver.com" <paul.gortmaker@...driver.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] vmcore: prevent PT_NOTE p_memsz overflow during header
 update

On Sat, 1 Feb 2014 01:07:29 +0000 "Pearson, Greg" <greg.pearson@...com> wrote:

> As far as I know the only consequence of dropping a PT_NOTE entry is 
> that it would not be available in the crash dump for use in debugging. 
> I'm not sure how important this data might be for triage. I'm guessing 
> that in cases where one of these strange PT_NOTE entries shows up with a 
> size that causes an overflow it probably isn't even a real PT_NOTE entry 
> so dropping it won't matter, but that's a guess at this point since I'm 
> still trying to figure out how the bogus entries were created.

Can we detect the crazy-huge notes, skip them and then proceed with
the following sanely-sized ones?

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