linux-kernel - Re: [ubuntu-hardened] Add overflow protection to kref

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Date:	Fri, 17 Feb 2012 09:33:19 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	David Windsor <dwindsor@...il.com>
Cc:	Kees Cook <keescook@...omium.org>,
	Greg KH <gregkh@...uxfoundation.org>, pageexec@...email.hu,
	Ubuntu security discussion <ubuntu-hardened@...ts.ubuntu.com>,
	spender@...ecurity.net, linux-kernel@...r.kernel.org,
	kernel-hardening@...ts.openwall.com
Subject: Re: [ubuntu-hardened] Add overflow protection to kref

On Thu, Feb 16, 2012 at 09:48:38PM -0500, David Windsor wrote:
> <snip>
> 
> >>
> >> I have yet to see a patch, so why are we arguing about this?  :)
> >>
> >> Again, I don't know of any kref overflows that have ever happened, so
> >> trying to "protect" this type of thing, seems odd to me.
> >
> > Well, I think the issue was to protect counting things (which seems to
> > be what PaX was after originally), and that kref seemed like the place
> > to put it. I'll let David take it further.
> >
> 
> Patches are forthcoming that will first introduce overflow protection
> to kref.

Patches have already been posted:
http://marc.info/?l=linux-kernel&m=132337541830590&w=4
They were dropped for various (uninteresting) reasons, though.

> Once that's in place, I'll move a few refcount users from
> atomic_t to kref as a reference for other subsystems;

This sucks because dtor argument is mandatory.
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