Messages in this thread | | | Date | Fri, 27 May 2011 17:50:33 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [RFC][PATCH] Randomize kernel base address on boot |
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On 05/27/2011 02:51 PM, Olivier Galibert wrote: > On Fri, May 27, 2011 at 08:17:24PM +0200, Ingo Molnar wrote: >> - A root exploit will still not give away the location of the >> kernel (assuming module loading has been disabled after bootup), >> so a rootkit cannot be installed 'silently' on the system, into >> RAM only, evading most offline-storage-checking tools. >> >> With static linking this is not possible: reading the kernel image >> as root trivially exposes the kernel's location. > > There's something I don't get there. If you managed to escalate your > priviledges enough that you have physical ram access, there's a > billion things you can do to find the kernel, including vector > tracing, pattern matching, looking at the page tables, etc. > > What am I missing? >
Just makes it harder to automate an attack, and more likely that it will fail. It's an arms race, of course.
-hpa
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