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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