main.c

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#include <xtf.h>
 
const char test_title[] = "XSA-122 PoC";
 
/*
 * Check a buffer of a specified size for non-NUL bytes following the string
 * NUL terminator.
 */
static void check_buffer(const char *ref, const char *buf, size_t buf_sz)
{
    unsigned int i;
    size_t str_len = strnlen(buf, buf_sz);
 
    if ( str_len == buf_sz )
        return xtf_warning("    %s string not NUL terminated\n", ref);
 
    else if ( str_len == buf_sz - 1 )
        return; /* No trailing space after data. */
 
    for ( i = str_len + 1; i < buf_sz && buf[i] == '\0'; ++i )
        ; /* No action. */
 
    if ( i != buf_sz )
        xtf_failure("    '%s' has leaked stack at index %u\n", ref, i);
}
 
void test_main(void)
{
    long rc;
 
    printk("XENVER_extraversion:\n");
    {
        xen_extraversion_t extra;
 
        memset(&extra, 0, sizeof(extra));
 
        rc = hypercall_xen_version(XENVER_extraversion, extra);
        if ( rc < 0 )
            return xtf_failure("XENVER_extraversion error %ld\n", rc);
 
        printk("  Got '%s'\n", extra);
        check_buffer("extraversion", extra, sizeof(extra));
    }
 
    printk("XENVER_compile_info:\n");
    {
        xen_compile_info_t ci;
 
        memset(&ci, 0, sizeof(ci));
 
        rc = hypercall_xen_version(XENVER_compile_info, &ci);
        if ( rc < 0 )
            return xtf_failure("XENVER_compile_info error %ld\n", rc);
 
        printk("  Got '%s'\n"
               "      '%s'\n"
               "      '%s'\n"
               "      '%s'\n",
               ci.compiler, ci.compile_by, ci.compile_domain, ci.compile_date);
 
        check_buffer("compiler", ci.compiler, sizeof(ci.compiler));
        check_buffer("compile_by", ci.compile_by, sizeof(ci.compile_by));
        check_buffer("compile_domain", ci.compile_domain, sizeof(ci.compile_domain));
        check_buffer("compile_date", ci.compile_date, sizeof(ci.compile_date));
    }
 
    printk("XENVER_changeset:\n");
    {
        xen_changeset_info_t ci;
 
        memset(&ci, 0, sizeof(ci));
 
        rc = hypercall_xen_version(XENVER_changeset, &ci);
        if ( rc < 0 )
            return xtf_failure("XENVER_changeset error %ld\n", rc);
 
        printk("  Got '%s'\n", ci);
        check_buffer("changeset_info", ci, sizeof(ci));
    }
 
    xtf_success(NULL);
}
 
/*
 * Local variables:
 * mode: C
 * c-file-style: "BSD"
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */