[PATCH] malloc: verify the size of top chuck, stopping House of Force

[Florian Weimer]

On 08/16/2018 09:38 PM, Zack Weinberg wrote:
> On Thu, Aug 16, 2018 at 3:29 PM, DJ Delorie <dj@redhat.com> wrote:
>>
>> Florian Weimer <fweimer@redhat.com> writes:
>>> DJ, will you apply this patch?  We do not need copyright assignment for
>>> this.
>>
>> Done.  Thanks!
> 
> Should we have a test case for this?  It doesn't look hard to write,
> going by https://heap-exploitation.dhavalkapil.com/attacks/house_of_force.html

I don't think it's possible to create a valuable test case for this 
which will stop crashing once we regress the actual hardening.  It's too 
likely that such a change would still crash the test, resulting in a 
false positive.

Thanks,
Florian