linux-yocto/6.6: arm: jitter entropy backport

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" <aospan@amazon.com>
    Signed-off-by: Stephan Mueller <smueller@chronox.de>
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
]

(From OE-Core rev: 1349b759e9b8f363ab9a9feec531f3a877f97dec)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

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"