bin/63535: getpwent segfaults when NIS groups used by top, finger

[Daniel Ellard]

>Number:         63535
>Category:       bin
>Synopsis:       getpwent segfaults when NIS groups used by top, finger
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Feb 29 08:50:19 PST 2004
>Closed-Date:
>Last-Modified:
>Originator:     Daniel Ellard
>Release:        FreeBSD 4.8-RELEASE-p15 i386
>Organization:
Harvard University
>Environment:
System: FreeBSD ant.eecs.harvard.edu 4.8-RELEASE-p15 FreeBSD 4.8-RELEASE-p15 #5: Fri Feb 20 10:27:42 EST 2004 ellard at ant.eecs.harvard.edu:/usr/obj/usr/freebsd_4.8/src/sys/ANT i386

	This also occurs, with exactly the same symptoms,
	on 4.9-RELEASE-p2 and 4.7-RELEASE-p25

>Description:

	Applications like top and finger that use getpwent segfault
	if logins are limited via NIS groups.

>How-To-Repeat:

	You must be using NIS for passwords in order recreate this.
	Edit (usinv vipw or equiv) /etc/passwd: if there is a line
	like "+:::::::::" remove it and add "+ at foo:::::::::" where
	"foo" is a valid group name provided via NIS.  Then try running
	top or "finger bar" (where bar can be any name, valid or not).

	top or finger will segfault in getpwent.

>Fix:

	Unknown.


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