mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-16 10:20:30 +00:00
Code Issues Releases Activity

A regression test to ensure that arc4random returns different sequences

Browse Source 
in parent and child processes after a fork.
This commit is contained in:
David Schultz 2011-11-15 05:55:15 +00:00
parent 7a0789b485
commit 35ee51e291
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=227522
2 changed files with 91 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
tools/regression/lib/libc/gen/Makefile
View File

@ -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}

89
tools/regression/lib/libc/gen/test-arc4random.c Normal file
View File

@ -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);
}