398 lines
9.4 KiB
C
398 lines
9.4 KiB
C
/*
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* Copyright (c) 2011
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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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* bigexec.c
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*
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* Checks that argv passing works and is not restricted to an
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* unreasonably small size.
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*/
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#include <stdarg.h>
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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 <unistd.h>
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#include <limits.h>
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#include <assert.h>
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#include <err.h>
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#include <test161/test161.h>
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#define _PATH_MYSELF "/testbin/bigexec"
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////////////////////////////////////////////////////////////
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// words
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static const char word8[] = "Dalemark";
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static char word4050[4051];
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static char word16320[16321];
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static char word65500[65501];
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static
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void
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fill(char *buf, size_t buflen)
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{
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static const char *const names[22] = {
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"Alhammitt", "Biffa", "Cennoreth", "Dastgandlen", "Enblith",
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"Fenna", "Gull", "Hern", "Hildrida", "Kankredin", "Kialan",
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"Lenina", "Manaliabrid", "Mayelbridwen", "Noreth", "Osfameron",
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"Robin", "Tanamil", "Tanamoril", "Tanaqui", "Ynen", "Ynynen"
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};
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const char *name;
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size_t len;
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while (buflen > 4) {
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name = names[random()%22];
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len = strlen(name);
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if (len < buflen) {
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strcpy(buf, name);
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buf += len;
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buflen -= len;
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if (buflen > 1) {
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*buf = ' ';
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buf++;
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buflen--;
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}
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}
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}
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while (buflen > 1) {
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*buf = '.';
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buf++;
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buflen--;
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}
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*buf = 0;
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}
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static
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void
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prepwords(void)
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{
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srandom(16581);
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fill(word4050, sizeof(word4050));
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fill(word16320, sizeof(word16320));
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fill(word65500, sizeof(word65500));
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}
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////////////////////////////////////////////////////////////
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// execing/checking
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static
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void
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try(const char *first, ...)
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{
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const char *args[20];
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const char *s;
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va_list ap;
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int num;
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nprintf(".");
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assert(first != NULL);
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args[0] = _PATH_MYSELF;
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args[1] = first;
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num = 2;
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va_start(ap, first);
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while (1) {
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s = va_arg(ap, const char *);
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if (s == NULL) {
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break;
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}
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assert(num < 20);
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args[num++] = s;
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}
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nprintf("\n");
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assert(num < 20);
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args[num] = NULL;
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execv(_PATH_MYSELF, (char **)args);
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err(1, "execv");
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}
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static
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void
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trymany(int num, const char *word)
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{
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const char *args[num+2];
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int i;
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nprintf(".");
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args[0] = _PATH_MYSELF;
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for (i=0; i<num; i++) {
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args[i+1] = word;
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if(i%10)
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nprintf(".");
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}
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args[num+1] = NULL;
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execv(_PATH_MYSELF, (char **)args);
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err(1, "execv");
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}
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static
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int
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check(int argc, char *argv[], const char *first, ...)
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{
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const char *s;
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va_list ap;
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int pos;
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pos = 1;
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va_start(ap, first);
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s = first;
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while (s != NULL) {
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if (pos == argc) {
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/* not enough args */
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return 0;
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}
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assert(pos < argc);
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if (argv[pos] == NULL) {
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/* woops */
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warnx("argv[%d] is null but argc is %d", pos, argc);
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return 0;
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}
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if (strcmp(argv[pos], s) != 0) {
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/* does not match */
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return 0;
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}
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s = va_arg(ap, const char *);
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pos++;
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}
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if (pos != argc) {
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/* too many args */
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return 0;
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}
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if (argv[pos] != NULL) {
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warnx("argv[argc] is not null");
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return 0;
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}
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return 1;
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}
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static
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int
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checkmany(int argc, char *argv[], int num, const char *word)
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{
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int i;
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if (argc != num + 1) {
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/* wrong number of args */
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return 0;
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}
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for (i=1; i<argc; i++) {
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if (strcmp(argv[i], word) != 0) {
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/* doesn't match */
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return 0;
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}
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}
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return 1;
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}
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////////////////////////////////////////////////////////////
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// test driver
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static
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void
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dumpargs(int argc, char *argv[])
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{
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const char *s;
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int i;
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warnx("%d args", argc);
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warnx("argv[0]: %s", argv[0]);
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for (i=1; i<=argc; i++) {
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s = argv[i];
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if (s == NULL) {
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warnx("argv[%d]: is null", i);
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}
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else if (!strcmp(s, word8)) {
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warnx("argv[%d] is word8", i);
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}
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else if (!strcmp(s, word4050)) {
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warnx("argv[%d] is word4050", i);
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}
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else if (!strcmp(s, word16320)) {
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warnx("argv[%d] is word16320", i);
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}
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else if (!strcmp(s, word65500)) {
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warnx("argv[%d] is word65500", i);
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}
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else if (strlen(s) < 72) {
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warnx("argv[%d]: %s", i, s);
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}
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else {
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warnx("argv[%d] is %zu bytes, begins %.64s",
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i, strlen(s), s);
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}
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}
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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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if (argc < 0) {
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err(1, "argc is negative!?");
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}
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prepwords();
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assert(strlen(word8) == 8);
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assert(strlen(word4050) == 4050);
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assert(strlen(word16320) == 16320);
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assert(strlen(word65500) == 65500);
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assert(ARG_MAX >= 65536);
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if (argv == NULL || argc == 0 || argc == 1) {
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/* no args -- start the test */
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warnx("Starting.");
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/*
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* 1. Should always fit no matter what.
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*/
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warnx("1. Execing with one 8-letter word.");
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try(word8, NULL);
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}
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else if (check(argc, argv, word8, NULL)) {
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/*
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* 2. Fits in one page.
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*/
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warnx("2. Execing with one 4050-letter word.");
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try(word4050, NULL);
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}
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else if (check(argc, argv, word4050, NULL)) {
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/*
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* 3. Requires two pages but each word fits on a page.
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*/
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warnx("3. Execing with two 4050-letter words.");
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try(word4050, word4050, NULL);
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}
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else if (check(argc, argv, word4050, word4050, NULL)) {
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/*
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* 4. Requires the full 64K argv buffer, in large
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* chunks, with a little space for slop. Each word
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* fits on a page though. With null terminators and
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* 4-byte pointers the size is 4085*16 = 65360, and
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* with 8-byte pointers it would become 65424.
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*
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* Don't forget that argv[0] will be another 21 or 25
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* bytes and some implementations may reasonably need
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* to stash an ending NULL in the buffer too.
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*/
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warnx("4. Execing with 16 4050-letter words.");
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try(word4050, word4050, word4050, word4050,
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word4050, word4050, word4050, word4050,
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word4050, word4050, word4050, word4050,
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word4050, word4050, word4050, word4050,
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NULL);
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}
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else if (check(argc, argv,
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word4050, word4050, word4050, word4050,
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word4050, word4050, word4050, word4050,
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word4050, word4050, word4050, word4050,
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word4050, word4050, word4050, word4050,
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NULL)) {
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/*
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* 5. Requires more than one page for a single word.
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*/
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warnx("5. Execing with one 16320-letter word.");
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try(word16320, NULL);
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}
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else if (check(argc, argv, word16320, NULL)) {
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/*
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* 6. Ditto but makes sure it works with two of them.
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*/
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warnx("6. Execing with two 16320-letter words.");
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try(word16320, word16320, NULL);
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}
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else if (check(argc, argv, word16320, word16320, NULL)) {
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/*
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* 7. Requires the full 64K argv buffer.
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*/
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warnx("7. Execing with four 16320-letter words.");
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try(word16320, word16320, word16320, word16320,
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NULL);
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}
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else if (check(argc, argv, word16320, word16320,
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word16320, word16320, NULL)) {
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/*
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* 8. Also requires the full 64K argv buffer, but with
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* only one huge word.
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*/
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warnx("8. Execing with one 65500-letter word.");
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try(word65500, NULL);
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}
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else if (check(argc, argv, word65500, NULL)) {
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/*
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* 9. This fits on one page. Given 4-byte pointers,
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* (8+1+4)*300 = 3900. With 8-byte pointers, it
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* doesn't, but we aren't doing that. (Update this if
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* we ever move to a 64-bit platform.)
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*/
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assert((8+1+sizeof(char *))*300 < 4096);
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warnx("9. Execing with 300 8-letter words.");
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trymany(300, word8);
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}
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else if (checkmany(argc, argv, 300, word8)) {
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#if 1 /* enforce the full size */
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/*
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* 10. This requires the full 64K argv buffer.
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* With 4-byte pointers, (8+1+4)*5020 = 65260.
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* It also doesn't fit with 8-byte pointers.
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*
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* XXX for the time being, we'll allow less efficient
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* implementations that use two pointers per word.
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* Hence, (8+1+4+4)*3850 = 65450.
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*/
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assert((8+1+sizeof(char *))*5020 < 65536);
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assert((8+1+2*sizeof(char *))*3850 < 65536);
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warnx("10. Execing with 3850 8-letter words.");
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trymany(3850, word8);
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}
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else if (checkmany(argc, argv, 3850, word8)) {
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#else
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/*
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* 10a. This requires more than one page using small
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* words. With 4-byte pointers, (8+1+4)*1000 = 13000.
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*/
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warnx("10. Execing with 1000 8-letter words.");
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trymany(1000, word8);
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}
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else if (checkmany(argc, argv, 1000, word8)) {
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#endif
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nprintf("\n");
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warnx("Complete.");
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success(TEST161_SUCCESS, SECRET, "/testbin/bigexec");
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return 0;
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}
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else {
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warnx("Received unknown/unexpected args:");
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dumpargs(argc, argv);
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return 1;
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}
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success(TEST161_SUCCESS, SECRET, "/testbin/bigexec");
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}
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