linux-kernel - Re: [PATCH 1/4] pagemap: Require reads of /proc/pid/pagemap to be multiples of 8 (v2 of series)

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Message-Id: <20080605150502.77e7ade8.akpm@linux-foundation.org>
Date:	Thu, 5 Jun 2008 15:05:02 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Matt Mackall <mpm@...enic.com>
Cc:	ttuttle@...gle.com, linux-kernel@...r.kernel.org, stable@...nel.org
Subject: Re: [PATCH 1/4] pagemap: Require reads of /proc/pid/pagemap to be
 multiples of 8 (v2 of series)

On Thu, 05 Jun 2008 15:51:59 -0500
Matt Mackall <mpm@...enic.com> wrote:

> 
> On Thu, 2008-06-05 at 12:37 -0700, Andrew Morton wrote:
> > On Thu, 5 Jun 2008 14:38:10 -0400
> > "Thomas Tuttle" <ttuttle@...gle.com> wrote:
> > 
> > > This matches the behavior of /proc/kpage{count,flags}, and simplifies
> > > the logic a bit.
> > > 
> > > I also changed out and end in struct pagemapread to be u64* instead of
> > > char*, which makes put_user work the way it was intended.  (Before, it
> > > was only copying the bottom byte of a pagemap entry, because the target
> > > of the copy was a char*.)
> > 
> > This one is for 2.6.25.x?
> 
> This one is for 2.6.26. Something more like this for 2.6.25.x:
> 
> Because put_user bases its copy size on the size of the target pointer,
> not the source, it was copying only 1 byte rather than the intended 8.
> 
> Spotted-by: Thomas Tuttle <ttuttle@...gle.com>
> Signed-off-by: Matt Mackall <mpm@...enic.com>
> 
> diff -r 5030869d9ded fs/proc/task_mmu.c
> --- a/fs/proc/task_mmu.c	Thu Jun 05 04:01:40 2008 +0000
> +++ b/fs/proc/task_mmu.c	Thu Jun 05 15:45:00 2008 -0500
> @@ -531,7 +531,7 @@
>  		return PM_END_OF_BUFFER;
>  	}
>  
> -	if (put_user(pfn, pm->out))
> +	if (put_user(pfn, (u64 *)pm->out))
>  		return -EFAULT;
>  	pm->out += PM_ENTRY_BYTES;
>  	return 0;
> 
> 

OK.  I can't merge that I guess, so could someome please prepare a
formal patch for the stable guys?  Preferably one which remembers
to add __user to that cast :)
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