Re: [RFC PATCH 01/24] contrib/plugins: Use GRWLock in execlog

[Alex Bennée]

Akihiko Odaki <akihiko.odaki@daynix.com> writes:

> execlog had the following comment:
>> As we could have multiple threads trying to do this we need to
>> serialise the expansion under a lock. Threads accessing already
>> created entries can continue without issue even if the ptr array
>> gets reallocated during resize.
>
> However, when the ptr array gets reallocated, the other threads may have
> a stale reference to the old buffer. This results in use-after-free.
>
> Use GRWLock to properly fix this issue.
>
> Fixes: 3d7caf145e ("contrib/plugins: add execlog to log instruction execution 
> and memory access")
> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro