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Re: [PATCH 0/2] nptl: Update struct pthread_unwind_buf
On 02/09/2018 02:48 AM, Florian Weimer wrote:
> In short, the only thing need to ensure is that the over-write from
> __sigsetjmp stays within __cancel_buf. Then we are good, without
> changing the stack layout for cancellation.
> My proposal is still rather hackish, but so is the existing code (the
> truncated jump buffer), and HJ's approach of storing the shadow stack
> pointer in the signal save area of the non-truncated jump buffer. But
> I think we can make it work.
I disagree completely. I think this is an an elegant solution to an ugly
problem. We need to see if HJ has any other requirements which may conflict
with this suggestion.