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

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Message-ID: <CAEXv5_iRj6zHcKWtV0mgA4i_2u=TB1iQQMYFJAK4r6Ca=pimDA@mail.gmail.com>
Date:	Thu, 16 Feb 2012 21:48:38 -0500
From:	David Windsor <dwindsor@...il.com>
To:	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

<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.  Once that's in place, I'll move a few refcount users from
atomic_t to kref as a reference for other subsystems; statistics-based
users (and others not requiring overflow protection) can continue
using atomic_t.

As Kees said, we just wanted to introduce the idea and get some
general feedback before beginning.  Thanks.

> Thanks,
>
> -Kees
>
> --
> Kees Cook
> ChromeOS Security



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