linux-kernel - Re: [PATCH] proc: check vma->vm

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Message-ID: <20121015215230.GP19449@moon>
Date:	Tue, 16 Oct 2012 01:52:30 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Stanislav Kinsbursky <skinsbursky@...allels.com>,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
	criu@...nvz.org, ebiederm@...ssion.com, rientjes@...gle.com,
	devel@...nvz.org
Subject: Re: [PATCH] proc: check vma->vm_file before dereferencing

On Mon, Oct 15, 2012 at 02:40:48PM -0700, Andrew Morton wrote:
> On Mon, 15 Oct 2012 19:30:03 +0400
> Stanislav Kinsbursky <skinsbursky@...allels.com> wrote:
> 
> > It can be equal to NULL.
> > 
> 
> Please write better changelogs, so people do not have to ask questions
> such as:
> 
> - Under what conditions does this bug trigger?
> 
> - In which kernel version(s)?
> 
> - Is it a post-3.6 regression?

Andrew, would the following changelog be enough?

The commit 7b540d0646ce122f0ba4520412be91e530719742 switched
proc_map_files_readdir to use @f_mode directly instead of grabbing
@file reference, but same time the test for @vm_file presence was
lost leading to nil dereference. The patch brings the test back.

The all proc_map_files feature is CONFIG_CHECKPOINT_RESTORE wrapped
(which is set to 'n' by default) so the bug doesn't affect regular
kernels.

The regression is 3.7-rc1 only as far as I can tell.
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