[PATCH 2/4] S390: Use own tbegin macro instead of __builtin_tbegin.

[Torvald Riegel]

On Fri, 2017-01-13 at 17:22 +0100, Stefan Liebler wrote:
> On 01/13/2017 04:32 PM, Torvald Riegel wrote:
> > Anyway, I'm not sure whether this gives user code more means to exploit
> > or probe something, or not.  Maybe I was just too cautious here.
> >
> >
> That's correct, you can probe something.
> But if someone wants to do that, he can also start a transaction 
> directly without pthread_mutex_lock.

True, but it might be easier for an exploit to set up a call to existing
code than to either build binary code that starts transactions or find
suitable binary code elsewhere.