Messages in this thread | | | From | Myreen Johan <> | Subject | RE: Linux login security approaches | Date | Thu, 10 Dec 1998 10:01:10 +0200 |
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>All that you guys want is already in there, just no prominently documented >or used, > >serial lines: enable SAK (man setserial) >text console: alt-sys-K (less /usr/src/linux/Documentation/sysrq.txt) >X console: ctl-alt-backspace (man XFree86)
Both the Magic Sysreq Key and C-A-Backspace are intended to be debugging aids, and not to be used as Secure Attention Keys. At least that's what their documented purpose is, C-A-Backspace is an emergency escape from a wedged XFree86 session, and the Magic Sysreq Key is a security problem itself.
C-A-Backspace only kills X11, so it does not work as a SAK if X is started from the shell and not via xdm from init. You could drop right into a nice trojan.
Johan Myréen jem@iki.fi
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