>Number: 189284
>Category: bin
>Synopsis: dd(1): may write junk if conv=sparse with obs < ibs
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat May 03 11:40:00 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator: Thomas Quinot
>Release: FreeBSD 9.2-STABLE amd64
>Organization:
>Environment:
System: FreeBSD melamine.cuivre.fr.eu.org 9.2-STABLE FreeBSD 9.2-STABLE #0
r256080: Sun Oct 6 15:33:30 CEST 2013
[email protected]:/usr/obj/users/thomas/projects/FreeBSD/base/stable/9/sys/GENERIC
amd64
>Description:
When ibs is an integral multiple of ibs, and there is a sequence
of obs consecutive zeroes at the end of the last input block,
the last character written by dd may be some different (non-zero)
byte from the input stream.
>How-To-Repeat:
$ perl -e 'print "ABCDEFGH\0\0\0\0\0\0\0\0"'|dd ibs=16 obs=8 conv=sparse
of=toto
1+0 records in
2+0 records out
16 bytes transferred in 0.001373 secs (11653 bytes/sec)
$ od -a toto
0000000 A B C D E F G H nul nul nul nul nul nul nul A
0000020
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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