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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <474215859.237587.1307788231269.JavaMail.root@work1>
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,
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/