a65ddfdc81
is an easy hack to pass the test. This new version checks a little more of the write() spec and prevents the known exploitation.
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
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* The President and Fellows of Harvard College.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY 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 UNIVERSITY 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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/*
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* consoletest.c
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*
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* Tests whether console can be written to.
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*
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* This should run correctly when open and write syscalls are correctly
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* implemented.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <errno.h>
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#include <err.h>
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#include <test161/test161.h>
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// 23 Mar 2012 : GWA : BUFFER_COUNT must be even.
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#define STDOUT 1
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#define BUFFER_SIZE 1024
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#define NSEC_PER_MSEC 1000000ULL
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#define MSEC_PER_SEC 1000ULL
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static void *
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invalid_addr(int max) {
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return (void *)((0x70000000) - (random() % max));
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}
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static void
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init_random() {
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time_t sec;
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unsigned long ns;
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unsigned long long ms;
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__time(&sec, &ns);
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ms = (unsigned long long)sec * MSEC_PER_SEC;
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ms += (ns / NSEC_PER_MSEC);
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srandom((unsigned long)ms);
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}
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int
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main(int argc, char **argv)
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{
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// 23 Mar 2012 : GWA : Assume argument passing is *not* supported.
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(void) argc;
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(void) argv;
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int how_many, rv, i, len;
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char buffer[BUFFER_SIZE];
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init_random();
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len = snsecprintf(BUFFER_SIZE, buffer, SECRET, "Able was i ere i saw elbA", "/testbin/consoletest");
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how_many = (random() % 20) + 5;
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for (i = 0; i < how_many; i++) {
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rv = write(1, invalid_addr(0x1000000), len+1);
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if (rv != -1) {
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tprintf("Error: writing to invalid address!\n");
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} else if (errno != EFAULT) {
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tprintf("Error: Expected EFAULT, got %d\n", errno);
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}
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}
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// Insert a '\0' somewhere in the secured string to thwart kprintf attack.
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how_many = (random() % (len - 10)) + 5;
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for (i = BUFFER_SIZE-1; i > how_many; i--) {
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buffer[i] = buffer[i-1];
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}
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buffer[how_many] = '\0';
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++len;
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write(1, buffer, len);
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write(1, "\n", 1);
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return 0;
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}
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