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Date: Thu, 27 Jul 2017 09:40:09 +0200
From: Florian Weimer <fw@...eb.enyo.de>
To: oss-security@...ts.openwall.com
Subject: CVE-2017-11671: GCC generates incorrect code for RDRAND/RDSEED intrinsics
Earlier this year, a GCC bug was fixed which could lead to intrinsics
for RDRAND and (more likely) RDSEED to produce non-random results.
These instructions use the carry flag to report success or failure,
and GCC used to generate instruction sequences which clobbered the
flag before applications had a change to read it:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80180
https://gcc.gnu.org/ml/gcc-patches/2017-03/msg01349.html
Practical impact is hopefully limited because the intrinsics are
difficult to use due to an unrelated GCC usability issue, and inline
assembly is not impacted by this issue.
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