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37 lines
1.3 KiB
Diff
37 lines
1.3 KiB
Diff
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From 95a798d20060d2b648dd604321e347c85edfd783 Mon Sep 17 00:00:00 2001
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From: Stephan Mueller <smueller@chronox.de>
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Date: Mon, 12 Aug 2024 08:25:42 +0200
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Subject: [PATCH] crypto: jitter - set default OSR to 3
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The user space Jitter RNG library uses the oversampling rate of 3 which
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implies that each time stamp is credited with 1/3 bit of entropy. To
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obtain 256 bits of entropy, 768 time stamps need to be sampled. The
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increase in OSR is applied based on a report where the Jitter RNG is
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used on a system exhibiting a challenging environment to collect
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entropy.
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This OSR default value is now applied to the Linux kernel version of
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the Jitter RNG as well.
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The increase in the OSR from 1 to 3 also implies that the Jitter RNG is
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now slower by default.
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Reported-by: Jeff Barnes <jeffbarnes@microsoft.com>
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Signed-off-by: Stephan Mueller <smueller@chronox.com>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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---
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crypto/Kconfig | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/crypto/Kconfig
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+++ b/crypto/Kconfig
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@@ -1345,7 +1345,7 @@ config CRYPTO_JITTERENTROPY_MEMORY_BLOCK
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config CRYPTO_JITTERENTROPY_OSR
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int "CPU Jitter RNG Oversampling Rate"
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range 1 15
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- default 1
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+ default 3
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help
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The Jitter RNG allows the specification of an oversampling rate (OSR).
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The Jitter RNG operation requires a fixed amount of timing
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