linux-kernel - Re: [BUG] hfs_find_init() sb->ext

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Date:	Sat, 11 Jun 2011 12:30:31 +0200 (CEST)
From:	Clement LECIGNE <clement.lecigne@...asq.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [BUG] hfs_find_init() sb->ext_tree NULL pointer dereference

Hi Christoph,

----- Christoph Hellwig <hch@...radead.org> wrote:
> On Wed, Jun 08, 2011 at 01:07:55PM +0200, Clement LECIGNE wrote:
> -snip-
> Well, it can't happen in practice.  The extent file always fits into
> the first blocks for a valid extents file.  And yes, you could

If this can't happen then it should be reasonable to ban this case.

> artifically construct a filesystem where this is not true, and if you
> want to be cool call it a security issue.  But in the end anyone who
> mounts untrusted disk images has much worse issues than this, so don't
> do it.

Yes I agree but think about the case we are a simple user on the machine
without root. For example few years ago at my university I was able to
gain root priv thanks to a vulnerability in XFS quite similar to this one
(exploit which does the evil mmap(), plug usb key, automounting, sbam).

Best,

-- 
Clément LECIGNE,
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