home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!wupost!waikato.ac.nz!comp.vuw.ac.nz!zl2tnm!toyunix!don
- Newsgroups: comp.os.vms
- Subject: Re: HELP!!! Security problem for gurus. [Directories]
- Message-ID: <14628002@zl2tnm.gen.nz>
- From: don@zl2tnm.gen.nz (Don Stokes)
- Date: 3 Jan 93 12:00:19 GMT
- Sender: news@zl2tnm.gen.nz (GNEWS Version 2.0 news poster.)
- References: <1i6dd2INNrct@gap.caltech.edu>
- Distribution: world
- Organization: The Wolery
- Lines: 35
-
- carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick) writes:
- > You shouldn't be surprised. You see, RMS is also a *CRITICAL* entity. If it
- > runs across something that it doesn't understand, there are a few
- > possibilities:
- > 1) The disk is corrupted;
- > 2) The user's address space is corrupted;
- > 3) The system address space is corrupted;
- > 4) The system disk is corrupted.
- >
- > Now, case 1 might not warrant a bugcheck. Case 2 should, at the very least,
- > result in process deletion; Cases 3 and 4 both warrant a system crash before
- > corrupted memory/system disk can do any more damage. The idea is to have the
- > system fail safe: When in doubt, do whatever's most likely to insure the
- > integrity of the system; if that means getting the system manager's attention
- > with a >>> prompt on the console, so be it.
-
- RMS won't crash a system at all (unless BUGCHECKFATAL is set). The XQP might.
- RMS lives in exec mode; an unhandled condition will at worst take out the
- process.
-
- As for case (4), a corrupt system disk is _not_ a good reason to crash
- the system. In many cases keeping the thing up could be the difference
- between a clean recovery and having to restore from backup (possibly
- causing loss of data from between the last backup and the crash, at
- best losing valuable production time); ANALYZE/DISK/REPAIR _does_ work
- on a system disk. Of course if it's really scrozzled you might need to
- crash it and restore anyway. I can't think of any reason for the system
- to crash because it discovers a damaged file structure (as opposed to
- crashing because it ate something poisonous as a result), nor can I recall
- anyone losing a system because of file structure damage.
-
- --
- Don Stokes, ZL2TNM (DS555) don@zl2tnm.gen.nz (home)
- Network Manager, Computing Services Centre don@vuw.ac.nz (work)
- Victoria University of Wellington, New Zealand +64-4-495-5052
-