Messages in this thread | | | Date | Sun, 12 May 2002 18:42:04 +0200 | From | Jakob Østergaard <> | Subject | Re: [RFC] ext2 and ext3 block reservations can be bypassed |
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On Sun, May 12, 2002 at 06:23:21PM +0200, Kasper Dupont wrote: > Usually the last 5% of the diskspace on ext2 and ext3 > filesystems are reserved for root. But I just realized > that they can be bypassed by redirecting the output > from a suid root program to a file. > > This command will keep writing beyond the 95% limit: > while true ; do mount ; done >filename
Hej Kasper,
Sure you were not running the shell as root ? :)
The redirection is handled by your shell, mount doesn't have anything to do with the '>filename' part.
Actually, the more fun test is to mount > /etc/passwd or mount > /dev/hda
But this won't work either, unless your shell (and therefore you as a user, suid programs or not) have the permissions as required.
In short: I don't think you are seeing what you think you are seeing ;)
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