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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Greg KH <greg@kroah.com>, Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@elte.hu>
Subject: Re: [patch 1/5] vmalloc: do not check for freed locks on user maps
Date: Thu, 6 Mar 2008 13:34:58 +1100	[thread overview]
Message-ID: <200803061334.58481.nickpiggin@yahoo.com.au> (raw)
In-Reply-To: <alpine.LFD.1.00.0803060029131.3099@apollo.tec.linutronix.de>

On Thursday 06 March 2008 10:31, Thomas Gleixner wrote:
> On Thu, 6 Mar 2008, Nick Piggin wrote:

> > This is the kernel mapping. The user mapping is unmapped when
> > the userspace munmaps.
>
> Ok, my misinterpretation of that flag. Is the user space unmap in the
> same code path ? If yes, how can it be distinguished from the kernel
> space unmap ?

The flag I added so that the vmap can be passed to remap_vmalloc_range.
There were a couple of places at one point that were not zeroing out
the vmalloced memory correctly, so this just helps ensure we don't leak
data.

Userspace unmap is unmap_vmas and related code in mm/memory.c.


  reply	other threads:[~2008-03-06  2:36 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-05 16:03 [patch 0/5] object debugging infrastructure V2 Thomas Gleixner
2008-03-05 16:03 ` [patch 1/5] vmalloc: do not check for freed locks on user maps Thomas Gleixner
2008-03-05 16:28   ` Nick Piggin
2008-03-05 17:20     ` Thomas Gleixner
2008-03-05 22:56       ` Nick Piggin
2008-03-05 23:31         ` Thomas Gleixner
2008-03-06  2:34           ` Nick Piggin [this message]
2008-03-05 16:03 ` [patch 2/5] slab: add a flag to prevent debug_free checks on a kmem_cache Thomas Gleixner
2008-03-05 16:03 ` [patch 3/5] infrastructure to debug (dynamic) objects Thomas Gleixner
2008-03-05 16:04 ` [patch 4/5] debugobjects: add documentation Thomas Gleixner
2008-03-10 20:13   ` Randy Dunlap
2008-03-21 14:25     ` Thomas Gleixner
2008-03-05 16:04 ` [patch 5/5] debugobjects: add timer specific object debugging code Thomas Gleixner
2008-03-05 20:14   ` Thomas Gleixner
2008-03-05 18:53 ` [patch 0/5] object debugging infrastructure V2 Greg KH
2008-03-06  1:48 ` Greg KH
2008-03-06  7:54   ` Thomas Gleixner

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