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Re: rseq notes from Cauldron
* Mathieu Desnoyers:
>> We need to disable symbols in pthread_create, so that signal handlers
> I think you meant "disable signals".
Sorry, you are right.
>> We need a comment somehwere in NPTL about the reliance of the rseq
>> area on implicit deregistration. This is currently not a problem
>> because it lives on the stack (as static TLS), and the stack outlives
>> the thread. But if we ever change the TCB allocation, additional
>> steps may be required. It is NOT sufficient to block signals because
>> the kernel may write to the rseq area even without signals. This
>> should go into the rseq patch as well.
> This adds a hard requirement on using the IE TLS model AFAIU. Another
> action item on my end.
Yes, but given that glibc already has initial-exec TLS, the rest has
to be initial-exec, too, I think. At least in the current
implementation in the loader.