|From:||"H. Peter Anvin" <email@example.com>|
|To:||Linus Torvalds <firstname.lastname@example.org>, Ted Ts'o <email@example.com>, "H. Peter Anvin" <firstname.lastname@example.org>, Ingo Molnar <email@example.com>, Thomas Gleixner <firstname.lastname@example.org>|
|Subject:||[PATCH 0/3] RDSEED support for the Linux kernel|
|Date:||Tue, 4 Mar 2014 14:40:12 -0800|
|Cc:||Linux Kernel Mailing List <email@example.com>, "H. Peter Anvin" <firstname.lastname@example.org>|
From: "H. Peter Anvin" <email@example.com> Upcoming Intel silicon adds a new RDSEED instruction. Whereas RDRAND returns output from a PRNG, the RDSEED instruction returns fully conditioned entropy that is suitable for use as seeds to a PRNG. This patchset adds support for RDSEED in the Linux kernel in three places: 1. During bootup, use RDSEED to initialize the entropy pool if available (we already use RDRAND for this). We don't add any credit at this point, but it will give much better starting point. 2. In the slow path to add_interrupt_randomness, executed once per second, we take a single RDSEED sample and mix it into the entropy pool, crediting it at 50% of its rated entropy. This was suggested by Linus. 3. If we are about to block on /dev/random due to lack of entropy, attempt an "emergency pool refill" using RDSEED. Comments are, of course, appreciated. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to firstname.lastname@example.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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