kern/90521: UDF driver might calculate a wrong descriptor tag checksum

Björn König bkoenig at cs.tu-berlin.de
Fri Dec 16 17:20:10 PST 2005


>Number:         90521
>Category:       kern
>Synopsis:       UDF driver might calculate a wrong descriptor tag checksum
>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:   Sat Dec 17 01:20:02 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Björn König
>Release:        FreeBSD 6.0-RELEASE i386
>Organization:
>Environment:
System: FreeBSD hoppel.local 6.0-RELEASE FreeBSD 6.0-RELEASE #3: Sun Nov 27 19:50:05 CET 2005 bkoenig at hoppel.local:/home/bkoenig/obj/home/bkoenig/devel/freebsd/RELENG_6_0/src/sys/HOPPEL i386

>Description:
	According to ECMA-167 7.2.3 the bytes 0-3 and 5-15 should be used
	to calculate the checksum of a descriptor tag. Actually only
	the bytes 0-3 and 5-14 will be used.
	
>How-To-Repeat:
>Fix:
--- udf_vfsops.c-2005121701.diff begins here ---
--- src/sys/fs/udf/udf_vfsops.c.orig	Sat Dec 17 01:51:41 2005
+++ src/sys/fs/udf/udf_vfsops.c	Sat Nov 26 20:15:50 2005
@@ -296,7 +296,7 @@
 	if (tag->id != id)
 		return (EINVAL);
 
-	for (i = 0; i < 15; i++)
+	for (i = 0; i < 16; i++)
 		cksum = cksum + itag[i];
 	cksum = cksum - itag[4];
 
--- udf_vfsops.c-2005121701.diff ends here ---


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


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