Author: das
Date: Tue Nov 15 05:55:15 2011
New Revision: 227522
URL: http://svn.freebsd.org/changeset/base/227522
Log:
A regression test to ensure that arc4random returns different sequences
in parent and child processes after a fork.
Added:
head/tools/regression/lib/libc/gen/test-arc4random.c (contents, props
changed)
Modified:
head/tools/regression/lib/libc/gen/Makefile
Modified: head/tools/regression/lib/libc/gen/Makefile
==============================================================================
--- head/tools/regression/lib/libc/gen/Makefile Tue Nov 15 05:49:34 2011
(r227521)
+++ head/tools/regression/lib/libc/gen/Makefile Tue Nov 15 05:55:15 2011
(r227522)
@@ -1,6 +1,7 @@
# $FreeBSD$
-TESTS= test-fmtcheck test-fnmatch test-fpclassify test-posix_spawn test-wordexp
+TESTS= test-arc4random test-fmtcheck test-fnmatch \
+ test-fpclassify test-posix_spawn test-wordexp
.PHONY: tests
tests: ${TESTS}
Added: head/tools/regression/lib/libc/gen/test-arc4random.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/tools/regression/lib/libc/gen/test-arc4random.c Tue Nov 15
05:55:15 2011 (r227522)
@@ -0,0 +1,89 @@
+/*-
+ * Copyright (c) 2011 David Schultz
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+/*
+ * BUFSIZE is the number of bytes of rc4 output to compare. The probability
+ * that this test fails spuriously is 2**(-BUFSIZE * 8).
+ */
+#define BUFSIZE 8
+
+/*
+ * Test whether arc4random_buf() returns the same sequence of bytes in both
+ * parent and child processes. (Hint: It shouldn't.)
+ */
+int main(int argc, char *argv[]) {
+ struct shared_page {
+ char parentbuf[BUFSIZE];
+ char childbuf[BUFSIZE];
+ } *page;
+ pid_t pid;
+ char c;
+
+ printf("1..1\n");
+
+ page = mmap(NULL, sizeof(struct shared_page), PROT_READ | PROT_WRITE,
+ MAP_ANON | MAP_SHARED, -1, 0);
+ if (page == MAP_FAILED) {
+ printf("fail 1 - mmap\n");
+ exit(1);
+ }
+
+ arc4random_buf(&c, 1);
+
+ pid = fork();
+ if (pid < 0) {
+ printf("fail 1 - fork\n");
+ exit(1);
+ }
+ if (pid == 0) {
+ /* child */
+ arc4random_buf(page->childbuf, BUFSIZE);
+ exit(0);
+ } else {
+ /* parent */
+ int status;
+ arc4random_buf(page->parentbuf, BUFSIZE);
+ wait(&status);
+ }
+ if (memcmp(page->parentbuf, page->childbuf, BUFSIZE) == 0) {
+ printf("fail 1 - sequences are the same\n");
+ exit(1);
+ }
+
+ printf("ok 1 - sequences are different\n");
+ exit(0);
+}
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