On Thu, 3 Sep 2015, Peter Zijlstra wrote:
> I think we should try and just ban events with a read_size > 64k; that's
> one _large_ group -- there's other issues with that as well I imagine.
yes, I don't really have a use case for this, I just noticed the problem
because Debian apparently bumped
On Wed, Sep 02, 2015 at 12:34:41PM -0400, Vince Weaver wrote:
>
> OK, this time I found the actual bug.
>
> event->read_size is declared as a u16 in include/linux/perf_event.h
>
> but it is very easy to get event->read_size larger than 64k
> (in my case, create 1 events in a group).
>
> Bec
OK, this time I found the actual bug.
event->read_size is declared as a u16 in include/linux/perf_event.h
but it is very easy to get event->read_size larger than 64k
(in my case, create 1 events in a group).
Because we wrap around the u16, the
if (count < event->read_size) return
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