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Re: Tests requiring MD hooks

> That seems to be a bit tricky to write in a portable way: testing --x
> right in memory pages requires to put/copy some payload in a page and
> call it.

dlopen something, find a function with dlsym, disable exec on that
page and call the function.  Catch SIGSEGV, check siginfo.  mprotect
it back and call the function again.


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