Re: Rebooting the kernel without resetting uptime?
On Friday 03 December 2004 8:20 am, Stefan Midjich wrote:
> I know a guy i respect on IRC told me this is not possible but since
> this is the hackers list i thought the topic at least deserves a
> discussion. I guess i wont be able to sit still until someone either
> does it or shows me why it can't be done.
Of course you can. Just attach gdb to your running kernel and muck with the
global boottime structure. That's considered cheating, though, so don't do
it!
( a few minutes later )
Hmm, apparently either something has changed in kgdb in 5.3 or I just forgot
the magic incantation, because it doesn't seem to allow modification of
memory -- just "Bad file descriptor". Getting the address from there and
writing to /dev/kmem directly still works though.
the-cheat# uname -r
5.3-STABLE
the-cheat# uptime
9:03PM up 3485 days, 21:44, 1 user, load averages: 0.24, 0.12, 0.12
the-cheat# sysctl kern.boottime
kern.boottime: { sec = 80112, usec = 345099 } Mon May 22 00:20:00 1995
the-cheat#
:-P
Craig
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Re: Rebooting the kernel without resetting uptime?
Mike Silbersack wrote this message on Sun, Dec 05, 2004 at 20:24 -0600: > On Fri, 3 Dec 2004, Stefan Midjich wrote: > > >I know a guy i respect on IRC told me this is not possible but since this > >is the hackers list i thought the topic at least deserves a discussion. I > >guess i wont be able to sit still until someone either does it or shows me > >why it can't be done. > > Faking the uptime which is retrieved by netcraft and other services which > check TCP timestamps would be easy. > > Faking your local uptime might be a bit more work, there could be > sideeffects of accelerating the timecounters. Bah, it's not that hard, just write out the current uptime on shutdown, then update the boottime and uptime on bootup... make their sysctl's writable, it shouldn't be a problem.. though what's just a number, might as well make your uptime 500 years.. :) that'd really throw everyone.. -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not." ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Rebooting the kernel without resetting uptime?
On Fri, 3 Dec 2004, Stefan Midjich wrote: Hi I know a guy i respect on IRC told me this is not possible but since this is the hackers list i thought the topic at least deserves a discussion. I guess i wont be able to sit still until someone either does it or shows me why it can't be done. Faking the uptime which is retrieved by netcraft and other services which check TCP timestamps would be easy. Faking your local uptime might be a bit more work, there could be sideeffects of accelerating the timecounters. Mike "Silby" Silbersack ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Rebooting the kernel without resetting uptime?
Erik Udo wrote: Stefan Midjich wrote: Hi I know a guy i respect on IRC told me this is not possible but since this is the hackers list i thought the topic at least deserves a discussion. I guess i wont be able to sit still until someone either does it or shows me why it can't be done. Everthing is possible! Even more possible if the source is open! ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]" Im pretty interested in this aswellI'd have INFINITE uptime! =) - Julio ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Rebooting the kernel without resetting uptime?
Stefan Midjich wrote: Hi I know a guy i respect on IRC told me this is not possible but since this is the hackers list i thought the topic at least deserves a discussion. I guess i wont be able to sit still until someone either does it or shows me why it can't be done. Everthing is possible! Even more possible if the source is open! ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Rebooting the kernel without resetting uptime?
Hi I know a guy i respect on IRC told me this is not possible but since this is the hackers list i thought the topic at least deserves a discussion. I guess i wont be able to sit still until someone either does it or shows me why it can't be done. -- Med vänliga hälsningar Stefan Midjich, Swebase AB Tel: 042-20 15 00 Fax: 042-20 15 03 E-post: [EMAIL PROTECTED] Webb: http://swebase.com ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
