linux-kernel - Re: [stable] [PATCH] kernel 2.6.24.1 still vulnerable to the vmsplice local root exploit

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Message-ID: <84144f020802100911u7c1a3d3cm212c08d1bb3225d6@mail.gmail.com>
Date:	Sun, 10 Feb 2008 19:11:05 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Greg KH" <greg@...ah.com>
Cc:	"Oliver Pinter" <oliver.pntr@...il.com>,
	"Bastian Blank" <bastian@...di.eu.org>,
	"Niki Denev" <ndenev@...il.com>, "Willy Tarreau" <w@....eu>,
	linux-kernel@...r.kernel.org, jens.axboe@...cle.com,
	stable@...nel.org
Subject: Re: [stable] [PATCH] kernel 2.6.24.1 still vulnerable to the vmsplice local root exploit

On Feb 10, 2008 7:05 PM, Greg KH <greg@...ah.com> wrote:
> No, this is a different CVE, as it is a different problem from the
> original 09 and 10 report.
>
> It has been given CVE-2008-0600 to address this issue (09 and 10 only
> affect .23 and .24 kernels, and have been fixed.)
>
> > +             if(!access_ok(VERIFY_READ, base, len)) {
> > +                     error = -EFAULT;
> > +                     break;
> > +             }
>
> Hm, perhaps we should just properly check the len field instead?  That's
> what is being overflowed here...

Sorry, I forgot to cc you on this one:

http://lkml.org/lkml/2008/2/10/153

I don't see where the current code is checking that base is
accessible. We just check that we can copy the struct iovecs, right?

                        Pekka
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