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when a user logs on console, he's given with access to some devices, like dsp, vcs* or cdrom. If he leaves processes which has opened these devices and logs out, the processes still have access to the opened devices. This can be misused by malicious users. Example: (while :;do echo -n X;sleep 1;done)>/dev/vcs1& logout Proper solution may require modifications to linux kernel, something like vhangup for any device: stopio from sco unix or revoke.
assigned to nalin
While this bug seemed irrelevant the non tty case has at least one interesting abuse we should look at resolving. Moved to kernel where we need to do some of the work.
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