Re: [PATCH 3/3] x86: kernel base offset ASLR

[Julien Tinnes]

On Thu, Apr 4, 2013 at 1:19 PM, Julien Tinnes <jln@xxxxxxxxxx> wrote:
> On Thu, Apr 4, 2013 at 1:12 PM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>> On 04/04/2013 01:07 PM, Kees Cook wrote:
>>> However, the benefits of
>>> this feature in certain environments exceed the perceived weaknesses[2].
>>
>> Could you clarify?
>
> I think privilege reduction in general, and sandboxing in particular,
> can make KASLR even more useful. A lot of the information leaks can be
> mitigated in the same way as attack surface and vulnerabilities can be
> mitigated.

Case in point:
- leaks of 64 bits kernel values to userland in compatibility
sub-mode. Sandboxing by using seccomp-bpf can restrict a process to
the 64-bit mode API.
- restricting access to the syslog() system call

Julien
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