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Message-ID: <545D3985.4040401@redhat.com>
Date: Fri, 07 Nov 2014 22:28:37 +0100
From: Eric Blake <eblake@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: Re: random number generators - rand(), random(),
etc
On 11/07/2014 10:21 PM, jb wrote:
>>> https://sourceware.org/ml/libc-alpha/2014-11/msg00143.html
>>
>> 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 http://libvirt.org
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