[Bug libc/29437] arc4random is too slow

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29437

--- Comment #7 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Adhemerval Zanella from comment #6)
> For example, when a virtual machine is forked, restored, or duplicated, it's
> imperative that the RNG doesn't generate the same outputs. For this reason,
> there's a small protocol between hypervisors and the kernel that indicates
> this has happened, alongside some ID, which the RNG uses to reseed
> immediately, so as not to return the same numbers.

Except that this doesn't work because if the suspend/resume happens a little
bit later, the unprotected application buffer to which the random data has been
written is restore multiple times. So clearly the actual rules around this are
different and much more complicated.

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