libports: rename jitterentropy's memcpy

To prevent symbol aliasing when using the static jitterentropy library
rename it to 'jent_memcpy'.

Fixes #4516.

repos/libports/ports/jitterentropy.hash

@@ -1 +1 @@
-b982a76430613834d1df5877fd528e4fa0c65fb2
+a03bf871577242847d2be302ff4054197e8799e3

repos/libports/ports/jitterentropy.port

@@ -13,7 +13,8 @@ DIR_CONTENT(include/jitterentropy) := $(addprefix src/lib/jitterentropy/,\
                                                   jitterentropy.h)
 
 PATCHES   := src/lib/jitterentropy/jitterentropy_h.patch \
-             src/lib/jitterentropy/jitterentropy_delta_compare.patch
+             src/lib/jitterentropy/jitterentropy_delta_compare.patch \
+             src/lib/jitterentropy/jitterentropy_memcpy.patch
 PATCH_OPT := -p1 -d src/lib/jitterentropy
 
 #

repos/libports/src/lib/jitterentropy/jitterentropy-base-genode.cc

@@ -5,7 +5,7 @@
  */
 
 /*
- * Copyright (C) 2014-2017 Genode Labs GmbH
+ * Copyright (C) 2014-2022 Genode Labs GmbH
  *
  * This file is part of the Genode OS framework, which is distributed
  * under the terms of the GNU Affero General Public License version 3.
@@ -42,7 +42,7 @@ void jent_zfree(void *ptr, unsigned int len)
 }
 
 
-void *memcpy(void *dest, const void *src, size_t n)
+void *jent_memcpy(void *dest, const void *src, size_t n)
 {
 	return Genode::memcpy(dest, src, n);
 }

repos/libports/src/lib/jitterentropy/jitterentropy-base-genode.h

@@ -51,7 +51,7 @@ static inline __u64 rol64(__u64 word, unsigned int shift)
 	return (word << shift) | (word >> (64 - shift));
 }
 
-void *memcpy(void *dest, const void *src, size_t n);
+void *jent_memcpy(void *dest, const void *src, size_t n);
 
 #ifdef __cplusplus
 }

repos/libports/src/lib/jitterentropy/jitterentropy_memcpy.patch

@@ -0,0 +1,13 @@
+diff --git a/jitterentropy-base.c b/jitterentropy-base.c
+index 28b1462..3ea4c90 100644
+--- a/jitterentropy-base.c
++++ b/jitterentropy-base.c
+@@ -553,7 +553,7 @@ ssize_t jent_read_entropy(struct rand_data *ec, char *data, size_t len)
+ 			tocopy = (DATA_SIZE_BITS / 8);
+ 		else
+ 			tocopy = len;
+-		memcpy(p, &ec->data, tocopy);
++		jent_memcpy(p, &ec->data, tocopy);
+ 
+ 		len -= tocopy;
+ 		p += tocopy;