114 lines
2.1 KiB
C
114 lines
2.1 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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int max_error = 2;
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#include "common.h"
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int subtest = 0;
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int
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main(int argc, char *argv[])
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{
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#define CHUNKSIZE 8192
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#define CHUNKS1 3
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#define CHUNKS2 2
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#define CHUNKS (CHUNKS1+CHUNKS2)
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#define LARGESIZE 262144
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int i, fd;
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char *v[CHUNKS];
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#define STARTV 0x90000000
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char *vaddr = (char *) STARTV;
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ssize_t l;
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pid_t f;
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start(44);
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for(i = 0; i < CHUNKS; i++) {
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v[i] = mmap(vaddr, CHUNKSIZE, PROT_READ|PROT_WRITE, 0,
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-1, 0);
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if(v[i] == MAP_FAILED) {
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perror("mmap");
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fprintf(stderr, "mmap failed\n");
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quit();
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}
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if(v[i] != vaddr) {
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fprintf(stderr,
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"mmap said 0x%p but i wanted 0x%p\n",
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v[i], vaddr);
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quit();
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}
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vaddr += CHUNKSIZE;
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}
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#define DEV_ZERO "/dev/zero"
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if((fd=open(DEV_ZERO, O_RDONLY)) < 0) {
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perror("open");
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fprintf(stderr, "open failed for %s\n", DEV_ZERO);
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quit();
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}
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#define TOTAL1 (CHUNKS1*CHUNKSIZE)
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/* Make single read cross region boundary. */
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if((l=read(fd, v[0], TOTAL1)) != TOTAL1) {
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fprintf(stderr, "read %d but expected %d\n", l, TOTAL1);
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quit();
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}
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/* Force single copy to cross region boundary. */
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{
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char *t;
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t = v[CHUNKS1]+CHUNKSIZE-2;
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if((l=read(fd, t, CHUNKSIZE)) != CHUNKSIZE) {
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fprintf(stderr, "read %d but expected %d\n", l, CHUNKSIZE);
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quit();
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}
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}
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/* Now start a child to test bogus memory access */
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if((f = fork()) == -1) {
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perror("fork");
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quit();
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}
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if(f > 0) {
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int st;
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/* Parent waits. */
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if(waitpid(f, &st, 0) < 0) {
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perror("waitpid");
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quit();
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}
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if(!WIFEXITED(st)) {
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fprintf(stderr, "child not signaled\n");
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quit();
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}
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if(WEXITSTATUS(st) != 0) {
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fprintf(stderr, "child exited with nonzero status\n");
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quit();
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}
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} else {
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/* Child performs bogus read */
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int res;
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char *buf = v[CHUNKS-1];
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errno = 0;
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res = read(fd, buf, LARGESIZE);
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if(res >= 0) {
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fprintf(stderr, "res %d\n", res);
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quit();
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}
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if(errno != EFAULT) {
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fprintf(stderr, "errno %d\n", errno);
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quit();
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}
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return(0);
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}
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quit();
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return(-1);
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}
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