null pointer dereference and vm.mmap_min_addr.

[Piotr Karbowski]

Hi!

We have another security issue with null pointer in kernel, I have on
all boxes vm.mmap_min_addr = 4096, I don't remember default valve, if
default is 0, I think we should change it to be >0, maybe in default
/etc/sysctl.conf? (from baselayout).

Bug - http://lkml.org/lkml/2009/10/14/184

[Jeff Mitchell]

Piotr Karbowski wrote:
> Hi!
>
> We have another security issue with null pointer in kernel, I have on
> all boxes vm.mmap_min_addr = 4096, I don't remember default valve, if
> default is 0, I think we should change it to be >0, maybe in default
> /etc/sysctl.conf? (from baselayout).

vm.mmap_min_addr defaults to 4096 unless you change it. What exactly is
the problem?

--Jeff

[Piotr Karbowski]

So default is >0, there is no problem.