Another backdoor to secure mode

JF Martinez (jfm@sidney.remcomp.fr)
Tue, 23 Jul 1996 00:34:30 +0200

We all know back door number one: modules. There is another one the
IOPL and IOPERM system calls. If I am not wrong nothing impedes a
privileged program of writing directly to disk with these calls. Of
course it will to know about disk handling and file system layout.

The problem is: X windows needs these calls, so if you forbid them in
secure mode then bye bye X.

I am unsubscribing from the mail list due to holidays so CC comments to
my personal address.

-- 


			Jean Francois Martinez


Join the Free World side in the holy war against Microsoft's Evil Empire.
			(Ronald Reagan)