linux-kernel - Re: get_user_pages vs mmap MAP

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Message-Id: <20070506202225.ba6476b6.akpm@linux-foundation.org>
Date:	Sun, 6 May 2007 20:22:25 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: get_user_pages vs mmap MAP_FIXED bug

On Mon, 07 May 2007 11:26:44 +1000 Rusty Russell <rusty@...tcorp.com.au> wrote:

> On Sun, 2007-05-06 at 17:01 +1000, Rusty Russell wrote:
> > This bug is in 2.6.21-rc7-mm2, but not 2.6.21.  Haven't tested
> > 2.6.21-mm1 yet.
> 
> OK, 2.6.21-mm1 fails too.  2.6.21-git6 ... is fine.
> 
> Here's a standalone test using ptrace.  No kernel module req'd.
> 
> 	rusty@...ussy:~/linux-2.6.21-mm1$ ../examiner 
> 	ptrace says 0, child says 0x464c457f

thanks.

> Any clues Andrew?  Or should I take your patches and do a binary search?

I've been assuming that Nick's vm_operations.fault changes have broken
get_user_pages()'s manual faulting.  The next step is to wait for Nick to
turn up.

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