Attachment 310399 Details for Bug 453053 – Test program

Test program

test.c (text/plain), 1.17 KB, created by John Hawkes on 2008-06-26 22:49:52 UTC

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Creator: John Hawkes

Created: 2008-06-26 22:49:52 UTC

Size: 1.17 KB

patch

obsolete

>#include <stdio.h>
>#include <errno.h>
>#include <unistd.h>
>#include <fcntl.h>
>#include <sys/mman.h>
>
>int main()
>{
>    char filename[100];
>    int fd;
>    char *bad_addr;
>    size_t readlen;
>
>    /* Create a temporary filename with 1 byte contents */
>    sprintf(filename, "%s.%d", "/tmp/test.", getpid());
>    if ((fd = open(filename, O_RDWR | O_CREAT)) == -1) {
>	fprintf(stderr, "open failed\n");
>	goto exit;
>    }
>    if (write(fd, "x", 1) != 1) {
>	fprintf(stderr, "write failed\n");
>	goto exit;
>    }
>    close(fd);
>    if ((fd = open(filename, O_RDWR | O_CREAT)) == -1) {
>	fprintf(stderr, "re-open failed\n");
>	goto exit;
>    }
>
>    bad_addr = mmap(0, 1, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
>    if (bad_addr == 0) {
>	fprintf(stderr, "mmap failed\n");
>	goto exit;
>    }
>
>    readlen = read(fd, bad_addr, 1);	/* should fail with EFAULT */
>
>    if (readlen != -1) {
>	fprintf(stderr, "read unexpectedly succeeded: readlen:%ld(0x%X)\n",
>		readlen, readlen);
>    } else if (errno != EFAULT) {
>	fprintf(stderr, "read fails with errno %d, not EFAULT (=%d)\n",
>		errno, EFAULT);
>    } else {
>	fprintf(stdout, "Success!\n");
>    }
>
>exit:
>    close(fd);
>    unlink(filename);
>    return(0);
>}

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Attachments on bug 453053: 310399 | 310653