linux-kernel - Re: [patch 0/5] Support for sanitization flag in low-level page allocator

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Date:	Sun, 31 May 2009 00:14:44 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	"Larry H." <research@...reption.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...l.org>, linux-mm@...ck.org,
	Ingo Molnar <mingo@...hat.com>, pageexec@...email.hu,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>
Subject: Re: [patch 0/5] Support for sanitization flag in low-level page
	allocator


* Pekka Enberg <penberg@...helsinki.fi> wrote:

> Hi Larry,
> 
> On Sat, May 30, 2009 at 9:03 PM, Larry H. <research@...reption.com> wrote:
> > The first issue is that SLOB has a broken ksize, which won't take into
> > consideration compound pages AFAIK. To fix this you will need to
> > introduce some changes in the way the slob_page structure is handled,
> > and add real size tracking to it. You will find these problems if you
> > try to implement a reliable kmem_ptr_validate for SLOB, too.
> 
> Does this mean that kzfree() isn't broken for SLAB/SLUB? Maybe I 
> read your emails wrong but you seemed to imply that.

Yep, he definitely wrote that:

    http://lkml.org/lkml/2009/5/30/30

 [...]
 |
 | That's hopeless, and kzfree is broken. Like I said in my earlier 
 | reply, please test that yourself to see the results. Whoever 
 | wrote that ignored how SLAB/SLUB work and if kzfree had been used 
 | somewhere in the kernel before, it should have been noticed long 
 | time ago.
 |
 [...]

Very puzzling claims i have to say.

	Ingo
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