Date: Fri, 7 Nov 2014 21:21:52 +0000 (UTC) From: jb <jb.1234abcd@...il.com> To: oss-security@...ts.openwall.com Subject: Re: random number generators - rand(), random(), etc Michal Zalewski <lcamtuf@...> writes: > > > 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 ? jb
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