Re: [PATCH 0/4] xen: domain-tracked allocations, and fault injection

[Julien Grall <julien@xxxxxxx>]

Hi Andrew,

On 23/12/2020 16:34, Andrew Cooper wrote:
> This was not the christmas hacking project that I was planning to do, but it
> has had some exciting results.
>
> After some discussion on an earlier thread, Tamas has successfully got fuzzing
> of Xen working via kfx, and this series is a prototype for providing better
> testing infrastructure.
>
> And to prove a point, this series has already found a memory leak in ARM's
> dom0less smoke test.
You mention this series recently on the ML. So I decided to give a try 
and manage to reproduce your "memory leak".
I put it in quote because the problem is not Arm and instead your code. 
If you look at the implementation of _dzalloc() you are using 
_xmalloc(). So the memory is not guaranteed to be zeroed after been 
allocation.
This is breaking the expectation of the callers. What you want is using 
"_xzalloc()'.
Cheers,

--
Julien Grall