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- Newsgroups: comp.os.os2.misc
- Path: sparky!uunet!wupost!gumby!destroyer!ubc-cs!unixg.ubc.ca!ochealth
- From: ochealth@unixg.ubc.ca (ochealth)
- Subject: OS/2 Needs a Supervisor mode!
- Message-ID: <1992Aug16.001819.14010@unixg.ubc.ca>
- Sender: news@unixg.ubc.ca (Usenet News Maintenance)
- Nntp-Posting-Host: unixg.ubc.ca
- Organization: University of British Columbia, Vancouver, B.C., Canada
- References: <1992Aug14.031238.18568@msi.com> <1992Aug15.011002.25592@microsoft.com> <1992Aug15.230755.14630@chpc.utexas.edu>
- Date: Sun, 16 Aug 1992 00:18:19 GMT
- Lines: 67
-
-
- Well, some people have complained about OS/2 not having multiuser capabilities
- out of the box, but I think IBM should include a "Supervisor" or "root"
- mode, and a "User" mode as a bare minimum. A "restricted" mode would also
- be nice.
-
- Right now, it is easy for a Trojan Horse program to destroy a system;
- it is easy for a buggy program or a novice user to cripple the system.
- I can also think of a conceivable, albeit difficult way for a virus to spread.
-
- Right now, any program can modify the Config.sys file. It would be better
- to require a password supervisor mode to edit config.sys, delete/change
- dll and other drivers etc.
-
- When kernel patches came out, all you had to do was change the file
- mode of the kernel, rename it, then copy over the new one. Then reboot
- for changes to take effect. So there's nothing to stop another program
- from patching the kernel, or maliciously deleteing it. At a minimum, the
- kernel should lock its disk file, when it is runnig (this would require
- booting from a floppy to change it).
-
- Conceivable virus: an infected program could patch the kernel with its code.
- After a reboot, executable files could be infected by storing the
- virus at the start of
- the program. To cover its tracks, it could move the original code into
- EAs, and the program would look the same size in a DIR listing. Since
- most people don't know what's stored in EAs, they wouldn't notice EAs
- growing by a few Kb. It could spread by modifying programs on floppies
- (since OS/2 floppies retain EAs).
-
- If OS/2 provided some more protection by locking ALL system files (.sys, .dll,
- etc) then this would enhance security. It would be pretty simple for
- IBM to change the kernel to lock all the right files. This would then require
- rebooting from the installation disks to make changes. If IBM wanted to make
- things nicer, they could add a password protected Supervisor mode, which
- would let you change any of those files, and let you edit Config.sys.
-
- Restricted mode: right now there's no ownership of files, and permissions
- for deleting, viewing, etc. Adding all of those would be a major task, but
- what if IBM let you tag a program as "restricted" or "test" so it could
- only read/write/delete files in a certain directory. I don't think this would
- be as difficult as adding full ownership and priveleges, as in UNIX.
- This would let you test freeware/shareware, or unscrupulous Microsoft programs
- (ie Windows, Excel, Word) that "update" things without your consent or knowledge
-
- I'm thinking of writing a program that might prevent accidental modification
- of files: all I'd have to do is open all the files I want to protect,
- and with the proper sharing options, OS/2 would automatically prevent
- other programs deleting or modifying the files. Unfortunately, a malicious
- program could simply kill mine, and then do as it pleased. If the kernel
- took care of this, then no program could bypass it.
-
- (A lot of DLLs and drivers
- can't be changed anyway, since some part of the system is using them.
- Some files aren't used all the time, so they remain unprotected.)
-
- This could actually be a selling point! A few *modest* changes would make
- OS/2 more secure: great for paranoid companies/governments. Many (all?)
- PS/2s and a lot of newer machines have a CMOS boot password, OS/2
- could add a deeper level of computer security.
-
-
- --
- ______________________________________________________________________________
- jpm: ochealth@unixg.ubc.ca
- Happily using OS/2 2.0 because MS Windows isNT ___
- Insert VapourFeature ^^^
-