kern/189941: getgroups(2) implements first argument as unsigned int

[Peter Holm]

>Number:         189941
>Category:       kern
>Synopsis:       getgroups(2) implements first argument as unsigned int
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon May 19 09:30:00 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator:     Peter Holm
>Release:        11.0-CURRENT
>Organization:
>Environment:
FreeBSD x4.osted.lan 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r265724: Fri May  9 03:32:53 CEST 2014     pho at x4.osted.lan:/usr/src/sys/i386/compile/PHO  i386

>Description:
Passing -1 as gidsetlen is not detected. Discovered by ATF. Caught on Ubuntu and OS/X.
>How-To-Repeat:
#include <err.h>
#include <errno.h>
#include <unistd.h>
#include <sys/param.h>

int
main(void)
{
        gid_t gidset[NGROUPS_MAX];

        if (getgroups(-1, gidset) != -1)
                errx(1, "getgroups(-1, ...) must fail.");
        else
                if (errno != EINVAL)
                        err(1, "getgroups(-1, ...) failed.");

        return (0);
}
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: