diff --git a/backport-Obey-restrictions-on-x86_rdrand_bytes-usage.patch b/backport-Obey-restrictions-on-x86_rdrand_bytes-usage.patch
new file mode 100644
index 0000000000000000000000000000000000000000..e4c8e58759b9efce082962130ffd4e84d6d93ef9
--- /dev/null
+++ b/backport-Obey-restrictions-on-x86_rdrand_bytes-usage.patch
@@ -0,0 +1,32 @@
+From 5244d384e706a546fd1a72cc004a9d6551f0d84b Mon Sep 17 00:00:00 2001
+From: Lon Willett <xgit@lonw.net>
+Date: Sun, 30 Sep 2018 21:25:07 +0200
+Subject: [PATCH 005/113] Obey restrictions on x86_rdrand_bytes usage
+
+---
+ rngd_rdrand.c | 9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/rngd_rdrand.c b/rngd_rdrand.c
+index ffb9e74..4529587 100644
+--- a/rngd_rdrand.c
++++ b/rngd_rdrand.c
+@@ -246,7 +246,14 @@ int xread_drng(void *buf, size_t size, struct rng *ent_src)
+ 	if (ent_src->rng_options[DRNG_OPT_AES].int_val)
+ 		return xread_drng_with_aes(buf, size, ent_src);
+ 
+-	x86_rdrand_bytes(buf, size);
++	/* NB: x86_rdrand_bytes might overrun end of buffer, if not a multiple of 8 */
++	if (size > 7)
++		x86_rdrand_bytes(buf, (size&~7));
++	if ((size&7) != 0) {
++		unsigned char tempbuf[8];
++		x86_rdrand_bytes(tempbuf, (size&7));
++		memcpy((unsigned char *)buf+(size&~7), tempbuf, (size&7));
++	}
+ 	return 0;
+ }
+ 
+-- 
+1.8.3.1
+
diff --git a/rng-tools.spec b/rng-tools.spec
index b3c476f7a5327400014f2ad996f85b867ac9cfcf..644df275b826c93d8595c88d3663b8df00bb9c00 100644
--- a/rng-tools.spec
+++ b/rng-tools.spec
@@ -1,6 +1,6 @@
 Name:            rng-tools
 Version:         6.5
-Release:         2
+Release:         3
 Summary:         Random number generator daemon
 License:         GPLv2+
 URL:             https://github.com/nhorman/rng-tools
@@ -10,6 +10,7 @@ Source2:         jitterentropy-library-2.2.0.tar.gz
 
 Patch0:          jitterentropy-remove-install.patch
 Patch1:          backport-Default-to-one-thread-if-getaffinity-returns-an-erro.patch
+Patch2:          backport-Obey-restrictions-on-x86_rdrand_bytes-usage.patch
 
 #Dependency
 BuildRequires:   gcc make gettext systemd autoconf automake
@@ -60,6 +61,9 @@ install -D -t $RPM_BUILD_ROOT%{_unitdir} -m 0644 %{SOURCE1}
 %{_mandir}/man8/rngd.8.*
 
 %changelog
+* Sat Dec 19 2020 yangzhuangzhuang <yangzhuangzhuang1@huawei.com> - 6.5-3
+- fix rngd.service coredump
+
 * Thu Dec 10 2020 yangzhuangzhuang <yangzhuangzhuang1@huawei.com> - 6.5-2
 - fix rngd.service coredump