linux-kernel - Re: [patch 1/5] vmalloc: do not check for freed locks on user maps

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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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