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Date: Fri, 07 Nov 2014 22:28:37 +0100
From: Eric Blake <>
Subject: Re: Re: random number generators - rand(), random(),

On 11/07/2014 10:21 PM, jb wrote:

>> In general, rand() and random() are not backed by cryptosafe PRNGs and
>> should not be used for security purposes.
>> /mz
> Well, rand() in Linux and ISO C standard are not threadsafe, but random(),
> srandom(), etc in Linux are claimed to be threadsafe:
> - pthread(7) - the function random() is listed as threadsafe
> - random(3)
>   Multithreading (see pthreads(7))
>        The random(), srandom(),  initstate(),  and  setstate()  functions  are
>        thread-safe.
> But apparently they are not.
> A problem ?

Maybe.  But not a security problem, because no security-conscious
program should be using random().  Therefore, I repeat my question -
what do you want this list to do about it?  You're not reaching the
right target audience.

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library

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