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Date: Sun, 19 Mar 2000 13:33:19 -0800 (PST)
From: alo@iki.fi
To: freebsd-gnats-submit@FreeBSD.org
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Subject: kern/17492: There is a bug in SIOCGIFCONF ioctl code
Sender: owner-freebsd-bugs@FreeBSD.ORG
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>Number:         17492
>Category:       kern
>Synopsis:       There is a bug in SIOCGIFCONF ioctl code
>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 Mar 19 13:40:01 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     Antti Louko
>Release:        3.4
>Organization:
>Environment:
FreeBSD h.louko.com 3.4-RELEASE FreeBSD 3.4-RELEASE #5: Sun Mar  5 20:52:36 EET 2000     root@h.louko.com:/usr/src/sys/compile/ALOFON  i386
>Description:
There is a bug in net/if.c in function ifconf where variable space
is compared with sizeof(ifr).  sizeof appears to always be
unsigned and int space, which can be negative, gets converted into
unsigned and is a very large number and greater than sizeof(ifr).
>How-To-Repeat:
It may be a little bit tricky to adjust all parameters
but it definitely is possible.
>Fix:
Change all sizeof(ifr) etc into (int)(sizeof(ifr))

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


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