From 6a92ea98544e0d03d4ce0563ad765ae21773b0fd Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Tue, 25 Apr 2017 11:00:36 +0200
Subject: [PATCH libICE 2/2] Add getentropy emulation through syscall

RHEL/f24/f25 only patch

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
 src/iceauth.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/src/iceauth.c b/src/iceauth.c
index 9b77eac..9af62f5 100644
--- a/src/iceauth.c
+++ b/src/iceauth.c
@@ -78,6 +78,55 @@ emulate_getrandom_buf (
     }
 }
 
+#ifndef HAVE_GETENTROPY
+#include <sys/syscall.h>
+#include <errno.h>
+
+/* code taken from libressl, license: */
+/*
+ * Copyright (c) 2014 Theo de Raadt <deraadt@openbsd.org>
+ * Copyright (c) 2014 Bob Beck <beck@obtuse.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Emulation of getentropy(2) as documented at:
+ * http://man.openbsd.org/getentropy.2
+ */
+#ifdef __NR_getrandom
+static int
+getentropy(void *buf, size_t len)
+{
+	int pre_errno = errno;
+	int ret;
+	if (len > 256)
+		return (-1);
+	do {
+		ret = syscall(__NR_getrandom, buf, len, 0);
+	} while (ret == -1 && errno == EINTR);
+
+	if (ret != len)
+		return (-1);
+	errno = pre_errno;
+
+	fprintf(stderr, "generating cookie with syscall\n");
+
+	return (0);
+}
+#define HAVE_GETENTROPY 1
+#endif /* __NR_getrandom */
+
+#endif /* HAVE_GETENTROPY */
+
 static void
 arc4random_buf (
 	char *auth,
-- 
2.9.3