linux-kernel - Re: [ 66/68] mm: Hold a file reference in madvise

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Message-ID: <20120713014927.GD3121@herton-Z68MA-D2H-B3>
Date:	Thu, 12 Jul 2012 22:49:27 -0300
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Hugh Dickins <hugh@...itas.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	Badari Pulavarty <pbadari@...ibm.com>,
	Nick Piggin <npiggin@...e.de>,
	Ben Hutchings <ben@...adent.org.uk>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [ 66/68] mm: Hold a file reference in madvise_remove

On Thu, Jul 12, 2012 at 04:02:40PM -0700, Greg Kroah-Hartman wrote:
> From: Greg KH <gregkh@...uxfoundation.org>
> 
> 3.0-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Andy Lutomirski <luto@...capital.net>
> 
> commit 9ab4233dd08036fe34a89c7dc6f47a8bf2eb29eb upstream.
> 
> Otherwise the code races with munmap (causing a use-after-free
> of the vma) or with close (causing a use-after-free of the struct
> file).
> 
> The bug was introduced by commit 90ed52ebe481 ("[PATCH] holepunch: fix
> mmap_sem i_mutex deadlock")
> 
> [bwh: Backported to 3.2:
>  - Adjust context
>  - madvise_remove() calls vmtruncate_range(), not do_fallocate()]
> [luto: Backported to 3.0: Adjust context]

Didn't want to be annoying, but as I went looking sequentially,
I found missing diffs one by one... anyway this should be the last.

> 
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