Alternative libio vtable hardening approach

[Florian Weimer]

On 06/01/2016 08:08 PM, Szabolcs Nagy wrote:
> On 31/05/16 14:07, Florian Weimer wrote:
>> The basic idea is to put all libc vtables into a single array, and then check whether the vtable pointer is
>> within that array.
>>
>
> does this mean that static linking anything with
> stdio will include all the code referenced from
> the vtables..

Correct.

> or was that already the case?

It was mostly the case already.  There are only small savings to be had, 
it seems.  I will post numbers along with a real patch proposal.

I have to use weak references anyway to avoid linknamespace issues, and 
we can add more if the current approach pulls in too much additional code.

Florian