linux-kernel - Re: [RFC PATCH] Randomization of address chosen by mmap.

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Date:   Tue, 27 Feb 2018 22:31:38 +0100
From:   lazytyped <lazytyped@...il.com>
To:     Kees Cook <keescook@...omium.org>, Ilya Smith <blackzert@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Michal Hocko <mhocko@...e.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Jan Kara <jack@...e.cz>, Jerome Glisse <jglisse@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Helge Deller <deller@....de>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>, Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>
Subject: Re: [RFC PATCH] Randomization of address chosen by mmap.



On 2/27/18 9:52 PM, Kees Cook wrote:
> I'd like more details on the threat model here; if it's just a matter
> of .so loading order, I wonder if load order randomization would get a
> comparable level of uncertainty without the memory fragmentation,

This also seems to assume that leaking the address of one single library
isn't enough to mount a ROP attack to either gain enough privileges or
generate a primitive that can leak further information. Is this really
the case? Do you have some further data around this?


       -  twiz