ignatz@aicchi.UUCP (Ihnat) (07/18/85)
Gosh, you have to go into a program? I just discovered tonight, while 'adb'ing a stripped object (DON'T ask why I would want to do it--object licensees have to do many things a respectable source licensee wouldn't *dream* of), that I can trash the kernel by simply trying to single-step through a system call! I'm running Xenix 3.0b on an Altos 586. I'm curious if this will happen on an AT or XT, but please...backup and 'sync' your disks if you're willing to attempt to make this sacrifice for the expansion of humankind's knowledge. If you've an Altos running Xenix? I dunno...maybe make 'adb' executable only by root? (heh, heh...) Dave "Damn, am I glad my 80-meg didn't get trashed" Ihnat Analysts International Corp. ihnp4!aicchi!ignatz ihnp4!aicchi!homebru!ignatz -- Dave Ihnat Analysts International Corporation (312) 882-4673 ihnp4!aicchi!ignatz
tang@mulga.OZ (Antony Tang) (07/21/85)
In article <518@aicchi.UUCP> ignatz@aicchi.UUCP (Ihnat) writes: >Gosh, you have to go into a program? I just discovered tonight, while >'adb'ing a stripped object (DON'T ask why I would want to do it--object >licensees have to do many things a respectable source licensee wouldn't >*dream* of), that I can trash the kernel by simply trying to single-step >through a system call! > In the manual of XENIX 1.0 for the AT, it read : "System calls cannot be single-stepped"
ignatz@aicchi.UUCP (Ihnat) (07/24/85)
In article <831@mulga.OZ> of net.unix-wizards, Anthony Tang responds to my comment in <518@aicchi.UUCP> : >>Gosh, you have to go into a program? I just discovered tonight, while >>'adb'ing a stripped object (DON'T ask why I would want to do it--object >>licensees have to do many things a respectable source licensee wouldn't >>*dream* of), that I can trash the kernel by simply trying to single-step >>through a system call! with: >In the manual of XENIX 1.0 for the AT, it read : "System calls cannot >be single-stepped" Mmmm-hmmmm. No argument; they (syscalls) shouldn't be. BUT--should any random, non-priviliged user--malicious or not--be able to trash the system with such a trivial mistake? I think not...oh, well... -- Dave Ihnat Analysts International Corporation (312) 882-4673 ihnp4!aicchi!ignatz