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Message-Id: <200803061334.58481.nickpiggin@yahoo.com.au>
Date: Thu, 6 Mar 2008 13:34:58 +1100
From: Nick Piggin <nickpiggin@...oo.com.au>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Greg KH <greg@...ah.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 1/5] vmalloc: do not check for freed locks on user maps
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.
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