Re: [Xen-devel] [PATCH v5.1 7/8] os-posix: Provide new -runas <uid>:<gid> facility

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Fri, Oct 20, 2017 at 02:38:21PM +0100, Ian Jackson wrote:
> +static bool os_parse_runas_uid_gid(const char *optarg)
> +{
> +    unsigned long lv;
> +    char *ep;
> +    uid_t got_uid;
> +    gid_t got_gid;
> +    int rc;
> +
> +    errno = 0;
> +    lv = strtoul(optarg, &ep, 0); /* can't qemu_strtoul, want *ep==':' */

Should strtoul base be 10? If that matter.

> +    got_uid = lv; /* overflow here is ID in C99 */
> +    if (errno || *ep != ':' || got_uid != lv || got_uid == (uid_t)-1) {
> +        return false;
> +    }
> +
> +    lv = 0;
> +    rc = qemu_strtoul(ep + 1, 0, 0, &lv);
> +    got_gid = lv; /* overflow here is ID in C99 */
> +    if (rc || got_gid != lv || got_gid == (gid_t)-1) {
> +        return false;
> +    }
> +
> +    user_uid = got_uid;
> +    user_gid = got_gid;
> +    return true;
> +}
> +
>  /*
>   * Parse OS specific command line options.
>   * return 0 if option handled, -1 otherwise
> @@ -145,8 +175,10 @@ void os_parse_cmd_args(int index, const char *optarg)
>  #endif
>      case QEMU_OPTION_runas:
>          user_pwd = getpwnam(optarg);
> -        if (!user_pwd) {
> -            fprintf(stderr, "User \"%s\" doesn't exist\n", optarg);
> +        if (!user_pwd && !os_parse_runas_uid_gid(optarg)) {
> +            fprintf(stderr,
> +                    "User \"%s\" doesn't exist (and is not <uid>.<gid>)\n",

The error message have not been update, I think it should be <uid>:<gid>

> +                    optarg);
>              exit(1);
>          }
>          break;

With the error message fix:
Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>

-- 
Anthony PERARD

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