93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/*-
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* Copyright (c) 2011 David Schultz
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <atf-c.h>
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/*
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* BUFSIZE is the number of bytes of rc4 output to compare. The probability
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* that this test fails spuriously is 2**(-BUFSIZE * 8).
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*/
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#define BUFSIZE 8
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/*
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* Test whether arc4random_buf() returns the same sequence of bytes in both
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* parent and child processes. (Hint: It shouldn't.)
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*/
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ATF_TC_WITHOUT_HEAD(test_arc4random);
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ATF_TC_BODY(test_arc4random, tc)
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{
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struct shared_page {
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char parentbuf[BUFSIZE];
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char childbuf[BUFSIZE];
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} *page;
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pid_t pid;
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char c;
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printf("1..1\n");
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page = mmap(NULL, sizeof(struct shared_page), PROT_READ | PROT_WRITE,
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MAP_ANON | MAP_SHARED, -1, 0);
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if (page == MAP_FAILED) {
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printf("fail 1 - mmap\n");
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exit(1);
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}
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arc4random_buf(&c, 1);
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pid = fork();
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ATF_REQUIRE(0 <= pid);
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if (pid == 0) {
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/* child */
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arc4random_buf(page->childbuf, BUFSIZE);
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exit(0);
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} else {
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/* parent */
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int status;
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arc4random_buf(page->parentbuf, BUFSIZE);
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wait(&status);
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}
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ATF_CHECK_MSG(memcmp(page->parentbuf, page->childbuf, BUFSIZE) != 0,
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"sequences are the same");
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, test_arc4random);
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return (atf_no_error());
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}
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