Error setting kernel variables

Derek Broughton news at
Tue May 20 18:04:53 UTC 2008

Bruno Costacurta wrote:

> Hello to all,
> I have the following (non-blocking) error during boot :
> Setting kernel variables...
> error: "vm.mmap_min_addr" is an unknown key

In the Hardy upgrade, /etc/sysctl.conf got this mod:
 # protect bottom 64k of memory from mmap to prevent NULL-dereference
 # attacks against potential future kernel security vulnerabilities.
 # (Added in kernel 2.6.23.)
 vm.mmap_min_addr = 65536

I expect you're actually running a kernel prior to 2.6.23 (so am I, and I
probably also get that message, though it's a few days since I've booted
and I have never noticed it).

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