Am 14.01.2013 03:11, schrieb Adam Carter: > shred and dd available, but not srm etc > > I want to remove the user account info before the device is returned, > but dont want to cripple the device. Filesystem is ext3 with default > mount options, which implies its mounted with the default data=ordered, > and according to the docs "In both the data=ordered (default) and > data=writeback modes, shred works as usual" > > Would these steps be effective? > - set root pw back to installation default > - manually create copies of passwd and shadow (named passwd2 shadow2, > NOT by copying files then deleting extra lines) containing only the > default installation entries > - shred /etc/passwd /etc/shadow
Don't forget the backup files created by some tools. For example "/etc/passwd-" > - mv passwd2 and shadow2 to passwd and shadow > - dd if=/dev/zero of=/blah (to blank all spare blocks on fs, dd will > bail out once full. Will it miss info from non-fully allocated blocks?) Don't forget to do this as root to get the last 5%. If you want to be sure, you can try several overwrite cycles, for example with binary ones. The easiest way I know to generate such a sequence is `tr '\000' '\377' < /dev/zero | dd of=...`. Or you can just allocate /blah and then `shred` it. > - rm /blah If you have swap, you should clear that, too. Regards, Florian Philipp
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