linux-kernel - Re: [PATCH AUTOSEL 5.15 22/41] video: fbdev: pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu

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Message-ID: <20220921051045.dqnivsbrigwqlkan@altlinux.org>
Date:   Wed, 21 Sep 2022 08:10:45 +0300
From:   Vitaly Chikunov <vt@...linux.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.15 22/41] video: fbdev: pxa3xx-gcu: Fix integer
 overflow in pxa3xx_gcu_write

Sasha,

On Mon, Sep 19, 2022 at 06:24:42PM -0400, Sasha Levin wrote:
> On Mon, Sep 19, 2022 at 11:21:43AM +0300, Vitaly Chikunov wrote:
> > On Mon, Jun 27, 2022 at 10:20:41PM -0400, Sasha Levin wrote:
> > > From: Hyunwoo Kim <imv4bel@...il.com>
> > > 
> > > [ Upstream commit a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7 ]
> > > 
> > > In pxa3xx_gcu_write, a count parameter of type size_t is passed to words of
> > > type int.  Then, copy_from_user() may cause a heap overflow because it is used
> > > as the third argument of copy_from_user().
> > 
> > Why this commit is still not in the stable branches?
> 
> Mostly because it's not tagged for stable.
> 
> But really, looks like I've missed a batch a few months ago, I can push
> it for the next release cycle.
> 
> > Isn't this is the fix for CVE-2022-39842[1]?
> 
> How the heck did this thing get a CVE?

More than that, they also assign high severity score to it:
  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  Confidentiality Impact (C)  High
  Integrity Impact (I)        High
  Availability Impact (A)     High

Thanks,

> 
> -- 
> Thanks,
> Sasha