From: Clement LECIGNE <clement.lecigne@netasq.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [BUG] hfs_find_init() sb->ext_tree NULL pointer dereference
Date: Sat, 11 Jun 2011 12:30:31 +0200 (CEST) [thread overview]
Message-ID: <474215859.237587.1307788231269.JavaMail.root@work1> (raw)
In-Reply-To: <20110610214036.GA23163@infradead.org>
Hi Christoph,
----- Christoph Hellwig <hch@infradead.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,
prev parent reply other threads:[~2011-06-11 10:32 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-08 11:07 [BUG] hfs_find_init() sb->ext_tree NULL pointer dereference Clement LECIGNE
2011-06-10 21:40 ` Christoph Hellwig
2011-06-11 10:30 ` Clement LECIGNE [this message]
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