new file mode 100644
@@ -0,0 +1,144 @@
+From 3f1d6e53985e40cbe4c7380ce503ca2778d4cd9d Mon Sep 17 00:00:00 2001
+From: Neil Horman <nhorman@tuxdriver.com>
+Date: Mon, 16 May 2022 13:38:54 -0400
+Subject: [PATCH] Adjust jitterentropy library to timeout/fail on long delay
+
+When running rngd -l its possible, on platforms that have low jitter
+entropy to block for long periods of time. Adjust jitter to timeout on
+init after 5 seconds in the event it takes to long to gether jitter
+entropy
+
+Also while we're at it, I might have a build solution for the presence
+of internal timers. When jitterentropy is built without internal
+timers, jent_notime_init is defined publically, but when it is built
+with timers, its declared as a static symbol, preenting resolution, so
+we can test to see if the function exists. If it does we _don't_ have
+notime support. The logic is a bit backwards, but i think it works
+
+Upstream-Status: Backport from
+[https://github.com/nhorman/rng-tools/pull/171/commits/c29424f10a0dcbd18ac25607fa1c81c18a960e81]
+
+Signed-off-by: Xiangyu Chen <xiangyu.chen@eng.windriver.com>
+---
+ configure.ac | 6 ++---
+ rngd_jitter.c | 61 +++++++++++++++++++++++++++++++++++++++------------
+ 2 files changed, 50 insertions(+), 17 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 40008ca..2e12308 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -94,9 +94,9 @@ AS_IF(
+ AC_SEARCH_LIBS(jent_version,jitterentropy,
+ [AM_CONDITIONAL([JITTER], [true])
+ AC_DEFINE([HAVE_JITTER],1,[Enable JITTER])
+- AC_CHECK_LIB(jitterentropy, jent_entropy_switch_notime_impl,
+- [AC_DEFINE([HAVE_JITTER_NOTIME],1,[Enable JITTER_NOTIME])],
+- [],-lpthread)],
++ AC_CHECK_LIB(jitterentropy, jent_notime_init,
++ [],
++ [AC_DEFINE([HAVE_JITTER_NOTIME],1, [Enable JITTER_NOTIME])],-lpthread)],
+ AC_MSG_NOTICE([No Jitterentropy library found]),-lpthread)
+ ], [AC_MSG_NOTICE([Disabling JITTER entropy source])]
+ )
+diff --git a/rngd_jitter.c b/rngd_jitter.c
+index d1b17ba..3647b7f 100644
+--- a/rngd_jitter.c
++++ b/rngd_jitter.c
+@@ -400,6 +400,8 @@ int init_jitter_entropy_source(struct rng *ent_src)
+ int entflags = 0;
+ int ret;
+ int core_id = 0;
++ struct timespec base, now;
++ int rc;
+
+ signal(SIGUSR1, jitter_thread_exit_signal);
+
+@@ -508,6 +510,10 @@ int init_jitter_entropy_source(struct rng *ent_src)
+ CPU_FREE(cpus);
+ cpus = NULL;
+
++ flags = fcntl(pipefds[0], F_GETFL, 0);
++ flags |= O_NONBLOCK;
++ fcntl(pipefds[0], F_SETFL, flags);
++
+ if (ent_src->rng_options[JITTER_OPT_USE_AES].int_val) {
+ /*
+ * Temporarily disable aes so we don't try to use it during init
+@@ -516,32 +522,59 @@ int init_jitter_entropy_source(struct rng *ent_src)
+ message_entsrc(ent_src,LOG_CONS|LOG_INFO, "Initializing AES buffer\n");
+ aes_buf = malloc(tdata[0].buf_sz);
+ ent_src->rng_options[JITTER_OPT_USE_AES].int_val = 0;
+- if (xread_jitter(key, AES_BLOCK, ent_src)) {
+- message_entsrc(ent_src,LOG_CONS|LOG_INFO, "Unable to obtain AES key, disabling AES in JITTER source\n");
+- } else if (xread_jitter(iv_buf, CHUNK_SIZE, ent_src)) {
+- message_entsrc(ent_src,LOG_CONS|LOG_INFO, "Unable to obtain iv_buffer, disabling AES in JITTER source\n");
++ clock_gettime(CLOCK_REALTIME, &base);
++ do {
++ rc = xread_jitter(key, AES_BLOCK, ent_src);
++ clock_gettime(CLOCK_REALTIME, &now);
++ } while (rc && ((now.tv_sec - base.tv_sec) < 5));
++
++ if (rc) {
++ message_entsrc(ent_src,LOG_CONS|LOG_INFO, "Unable to obtain AES key, disabling JITTER source\n");
++ close_jitter_entropy_source(ent_src);
++ return 1;
++ }
++ do {
++ rc = xread_jitter(iv_buf, CHUNK_SIZE, ent_src);
++ clock_gettime(CLOCK_REALTIME, &now);
++ } while (rc && ((now.tv_sec - base.tv_sec) < 5));
++
++ if (rc) {
++ message_entsrc(ent_src,LOG_CONS|LOG_INFO, "Unable to obtain iv_buffer, disabling JITTER source\n");
++ close_jitter_entropy_source(ent_src);
++ return 1;
+ } else {
+ /* re-enable AES */
+ ent_src->rng_options[JITTER_OPT_USE_AES].int_val = 1;
+ ossl_ctx = ossl_aes_init(key, iv_buf);
+ }
+- xread_jitter(aes_buf, tdata[0].buf_sz, ent_src);
++
++ do {
++ rc = xread_jitter(aes_buf, tdata[0].buf_sz, ent_src);
++ clock_gettime(CLOCK_REALTIME, &now);
++ } while (rc && ((now.tv_sec - base.tv_sec) < 5));
++ if (rc) {
++ message_entsrc(ent_src,LOG_CONS|LOG_INFO, "Unable to obtain aes buffer, disabling JITTER source\n");
++ close_jitter_entropy_source(ent_src);
++ return 1;
++ }
++
+ } else {
+ /*
+- * Make sure that an entropy gathering thread has generated
+- * at least some entropy before setting O_NONBLOCK and finishing
+- * the entropy source initialization.
+- *
+ * This avoids "Entropy Generation is slow" log spamming that
+ * would otherwise happen until jent_read_entropy() has run
+ * for the first time.
+ */
+- xread_jitter(&i, 1, ent_src);
+- }
++ do {
++ rc = xread_jitter(&i, 1, ent_src);
++ clock_gettime(CLOCK_REALTIME, &now);
++ } while (rc && ((now.tv_sec - base.tv_sec) < 5));
++ if (rc) {
++ message_entsrc(ent_src,LOG_CONS|LOG_INFO, "Unable to prime jitter source, disabling JITTER source\n");
++ close_jitter_entropy_source(ent_src);
++ return 1;
++ }
+
+- flags = fcntl(pipefds[0], F_GETFL, 0);
+- flags |= O_NONBLOCK;
+- fcntl(pipefds[0], F_SETFL, flags);
++ }
+
+ message_entsrc(ent_src,LOG_DAEMON|LOG_INFO, "Enabling JITTER rng support\n");
+ return 0;
+--
+2.34.1
+
@@ -12,6 +12,7 @@ SRC_URI = "git://github.com/nhorman/rng-tools.git;branch=master;protocol=https \
file://init \
file://default \
file://rng-tools.service \
+ file://0001-Adjust-jitterentropy-library-to-timeout-fail-on-long.patch \
"
SRCREV = "381f69828b782afda574f259c1b7549f48f9bb77"
Backport patch from upstream[1] to adjust jitter to timeout on init after 5 seconds in the event it takes to long to gether jitter entropy.This also fix rng-tools take full cpu usage with whole cores on ARM platforms. [1] https://github.com/nhorman/rng-tools/pull/171/commits/c29424f10a0dcbd18ac25607fa1c81c18a960e81 Signed-off-by: Xiangyu Chen <xiangyu.chen@eng.windriver.com> --- ...ropy-library-to-timeout-fail-on-long.patch | 144 ++++++++++++++++++ .../rng-tools/rng-tools_6.15.bb | 1 + 2 files changed, 145 insertions(+) create mode 100644 meta/recipes-support/rng-tools/rng-tools/0001-Adjust-jitterentropy-library-to-timeout-fail-on-long.patch