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The POWER9 backend in GNU Compiler Collection (GCC) before version 10 could optimize multiple calls of the __builtin_darn intrinsic into a single call thus reducing the entropy of the random number generator. This occurred because a volatile operation was not specified. For example within a single execution of a program the output of every __builtin_darn() call may be the same.

🗓️ 18 Aug 2020 07:00:00Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 2 Views

GCC POWER9 prior to version 10 may merge builtin darn calls, lowering RNG entropy due to missing volatile.

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18 Aug 2020 07:00Current
7.8High risk
Vulners AI Score7.8
CVSS 25
CVSS 3.17.5
EPSS0.00537
2