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Date: Sat, 9 Apr 2016 07:42:02 -0700
From: lazytyped <lazytyped@...il.com>
To: kernel-hardening@...ts.openwall.com
Subject: Re: [RFC v2] mm: SLAB freelist randomization



On 4/9/16 7:24 AM, Thomas Garnier wrote:
>
> Yes and no. With slabinfo not being available if not root you are not
> sure when you start a new SLAB. You also can't quantify the risk of
> another allocation happening on a real machine under load.
>
> It decreases the odds on a successful overflow that just requires two
> allocations to follow one another. It doesn't mitigate heap overflows.
>

Both things you mention above are somehow unrelated to the freelist
randomization. But that's fine. This has no performance impact, so there
is no problem in having it (not that I would or would want to have a say
:-) ).

I was just arguing that hinting at that specific exploit as one that
would have had 'decreased' odds of exploitation didn't seem like the
best choice.


        -  twiz

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