Re: [Qemu-devel] [PATCH v2 3/3] tests: Add a tester for HMP commands

[Eric Blake <eblake@redhat.com>]

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On 03/30/2017 02:50 AM, Thomas Huth wrote:
> HMP commands do not get any automatic testing yet, so on certain
> QEMU machines, some HMP commands were causing crashes in the past.
> Thus we should test HMP commands in our test suite, too, to avoid
> that such problems creep in again in the future.
> 
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---

> +static const char *hmp_cmds[] = {
> +    "boot_set ndc",

> +/* Run through the list of pre-defined commands */
> +static void test_commands(void)
> +{
> +    char *response;
> +    int i;
> +
> +    for (i = 0; hmp_cmds[i] != NULL; i++) {
> +        if (verbose) {
> +            fprintf(stderr, "\t%s\n", hmp_cmds[i]);
> +        }
> +        response = hmp(hmp_cmds[i]);

I failed to notice this sooner, but hmp() is passing its first arg as a
format string through a printf family.  If hmp_cmds[i] ever gets
modified to include something with a %, it will misbehave.  Better is to
use hmp("%s", variable).

I've patched it locally as part of rebasing my work on avoiding dynamic
JSON format strings, if no one beats me to a fix (my series also adds
the gcc format attribute tag, so that the compiler catches any further
mismatches in hmp() format vs. arguments).

> +    while (*info) {
> +        /* Extract the info command, ignore parameters and description */
> +        g_assert(strncmp(info, "info ", 5) == 0);
> +        endp = strchr(&info[5], ' ');
> +        g_assert(endp != NULL);
> +        *endp = '\0';
> +        /* Now run the info command */
> +        if (verbose) {
> +            fprintf(stderr, "\t%s\n", info);
> +        }
> +        resp = hmp(info);

Another instance.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org


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