netdev - Re: [PATCH] ipv6: fix a potential use after free in sit.c

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Message-ID: <CAA93jw7qxXCSkWc4YRyiAJ9bwQnk4PwYX8eKfwZyZ2qnhM7QYQ@mail.gmail.com>
Date:	Sat, 18 Oct 2014 10:22:35 -0700
From:	Dave Taht <dave.taht@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, roy.qing.li@...il.com,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	ghorbel@...asoftware.com
Subject: Re: [PATCH] ipv6: fix a potential use after free in sit.c

On Sat, Oct 18, 2014 at 10:07 AM, David Miller <davem@...emloft.net> wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Indeed, I wish we could somehow automate this.
>
> Yes, I'm sure we could construct some sparse et al. rules but
> I mean at run time.  For example, having a special pointer type
> that you can't dereference directly.  At the time of assignment
> the pointer gets some kind of state, and pskb_may_pull() et al.
> calls invalidate that "state".
>
> It probably could just be a 2-bit counter which is incremented
> every time skb->data is reallocated.
>
> The captured 2-bit generation count could be stored in the low
> bits of the pointer.
>
> Anyways, just throwing out ideas...

So far as I know, the one machine linux has never been ported
to was a LISP machine. With its 36 bit words, and tagging, that
would do what you want. I had kind of hoped with 64 bits of
addressing some of those ideas would have been reused.

/me misses truly oddball architectures


-- 
Dave Täht

http://www.bufferbloat.net/projects/bloat/wiki/Upcoming_Talks
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