From 812dbc2769f82c126d76be85dfd46de13c41f697 Mon Sep 17 00:00:00 2001 From: Bruce Ashfield Date: Thu, 4 Jan 2024 10:36:47 -0500 Subject: linux-yocto/6.6: arm: jitter entropy backport MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Integrating the following commit(s) to linux-yocto/6.6: 1/1 [ Author: Stephan Müller Email: smueller@chronox.de Subject: crypto: jitter - add RCT/APT support for different OSRs Date: Thu, 21 Sep 2023 13:48:11 +0200 The oversampling rate (OSR) value specifies the heuristically implied entropy in the recorded data - H_submitter = 1/osr. A different entropy estimate implies a different APT/RCT cutoff value. This change adds support for OSRs 1 through 15. This OSR can be selected by the caller of the Jitter RNG. For this patch, the caller still uses one hard-coded OSR. A subsequent patch allows this value to be configured. In addition, the power-up self test is adjusted as follows: * It allows the caller to provide an oversampling rate that should be tested with - commonly it should be the same as used for the actual runtime operation. This makes the power-up testing therefore consistent with the runtime operation. * It calls now jent_measure_jitter (i.e. collects the full entropy that can possibly be harvested by the Jitter RNG) instead of only jent_condition_data (which only returns the entropy harvested from the conditioning component). This should now alleviate reports where the Jitter RNG initialization thinks there is too little entropy. * The power-up test now solely relies on the (enhanced) APT and RCT test that is used as a health test at runtime. The code allowing the different OSRs as well as the power-up test changes are present in the user space version of the Jitter RNG 3.4.1 and thus was already in production use for some time. Reported-by "Ospan, Abylay" Signed-off-by: Stephan Mueller Signed-off-by: Herbert Xu ] (From OE-Core rev: 1349b759e9b8f363ab9a9feec531f3a877f97dec) Signed-off-by: Bruce Ashfield Signed-off-by: Richard Purdie --- meta/recipes-kernel/linux/linux-yocto-tiny_6.6.bb | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'meta/recipes-kernel/linux/linux-yocto-tiny_6.6.bb') diff --git a/meta/recipes-kernel/linux/linux-yocto-tiny_6.6.bb b/meta/recipes-kernel/linux/linux-yocto-tiny_6.6.bb index 372a8e962f..5d87855a27 100644 --- a/meta/recipes-kernel/linux/linux-yocto-tiny_6.6.bb +++ b/meta/recipes-kernel/linux/linux-yocto-tiny_6.6.bb @@ -17,7 +17,7 @@ DEPENDS += "openssl-native util-linux-native" KMETA = "kernel-meta" KCONF_BSP_AUDIT_LEVEL = "2" -SRCREV_machine ?= "50cd24ddb6f0bcae01623196515ce62527bb79df" +SRCREV_machine ?= "ff7ae7b32324226330214197e9b849d1aa35accd" SRCREV_meta ?= "11390e802ca72f3549b9356f036b17e54afd7a34" PV = "${LINUX_VERSION}+git" -- cgit v1.2.3-54-g00ecf