Messages in this thread | | | Date | Thu, 2 May 2019 18:45:24 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] x86/entry/64: randomize kernel stack offset upon syscall |
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* David Laight <David.Laight@ACULAB.COM> wrote:
> It has already been measured - it is far too slow.
I don't think proper buffering was tested, was it? Only a per syscall RDRAND overhead which I can imagine being not too good.
> > Because calling tens of millions of system calls per second will > > deplete any non-CPU-RNG sources of entropy and will also starve all > > other users of random numbers, which might have a more legitimate > > need for randomness, such as the networking stack ... > > If the function you use to generate random numbers from the 'entropy > pool' isn't reversible (in a finite time) I don't think you really need > to worry about bits-in v bits-out.
Ok.
Thanks,
Ingo
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