Date: Tue, 6 Nov 2012 19:46:58 +0100 From: Paul Schenkeveld <freebsd@psconsult.nl> To: freebsd-security@freebsd.org Subject: md(4) (swap-base) disks not cleaned on creation Message-ID: <20121106184658.GA24262@psconsult.nl>
next in thread | raw e-mail | index | archive | help
Hi, When creating a swap based md(4) it may contain data which to me feels like a security leak: # mdconfig -a -t swap -s 1m md0 # hd /dev/md0 00000000 c0 9b a8 00 08 00 00 00 00 5c 53 00 08 00 00 00 |À.¨......\S.....| 00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 00000250 38 9f a8 00 08 00 00 00 00 5c 53 00 08 00 00 00 |8.¨......\S.....| 00000260 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 00000330 88 a0 a8 00 08 00 00 00 00 5c 53 00 08 00 00 00 |. ¨......\S.....| 00000340 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 00000370 e8 a0 a8 00 08 00 00 00 00 5c 53 00 08 00 00 00 |è ¨......\S.....| 00000380 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 000005b0 48 a4 a8 00 08 00 00 00 00 5c 53 00 08 00 00 00 |H¤¨......\S.....| 000005c0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * ^C # ls -l /dev/md0 crw-r----- 1 root operator 0xc8 Nov 6 19:42 /dev/md0 # Although not world-readable, it just doesn't feel right to me. Any thoughts? With kind regards, Paul Schenkeveld
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20121106184658.GA24262>