Re: Jails: Setting different times in jails
Why on earth would you want this? Hi. Since your quote of my note was not to the original, I'll repost it here. Kurt Lidl also posted useful situations on these lists. Also, being able to have time tick backwards in jails could be interesting fuzzing too :-) Enjoy. Would be nice to be able to set different times in different jails. All jails would tick in step with the system. But each jail could have it's birthtime set specifically via jail(8), jail(2), etc. Either by specification of a specific time, or an offset from the current true system time. ie: jail(8): -t [-|+]seconds Child jails would offset from their parent, not the system. Internally, gettimeofday, filesystem timestamps, and any other userland interfaces would be hooked and adjusted by referencing a table of jail ID's and their offsets. Similar to how setting TZ or /etc/localtime effects a timezone offset. But transparent and undetectable to the jail unless set as visible by the invoker. Useful for creating alternate histories, testing time dependant protocols and applications, forensics, pen testing, etc. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Re: Jails: Setting different times in jails
On Sat, Jul 09, 2011 at 11:19:23PM -0600, Warner Losh wrote: Why on earth would you want this? Oh, it's not hard to imagine why you want to do this. Say you're testing a particular date rollover event, and want to make sure your software is up to snuff. Doing it in a jail would make it easy to do it. I hacked over a unix kernel to do this for Y2K testing, along with the company's mandatory 9/9/99 testing (and we extended it through to 1-Mar-2000 just to be thorough). In that case, not only did I just start the systems with a clock value of 9/8/99, I hacked it so the time was incremented by one second at each hardclock, rather than 1/100 of a second. So my applications saw every second of every day between 9/8/99 and 3/1/00. (Remember that 28-Feb-2000 went straight through to 1-Mar-2000 -- 2000 was NOT a leap year!) Heck, maybe if this got put in, Apple would pick it up and finally make the calandering stuff in OS X not fail every daylight savings time. Nah, I'm just dreaming now... -Kurt On Jul 7, 2011, at 2:31 AM, grarpamp wrote: possibly achievable in libc? I don't know. Where else would it be done? stat, utimes, gettimeofday, clock_gettime, adjtime, etc and their variations. I've not checked what currently happens, but I don't think root in a jail should be able to set any kernel time parameters, absent a syscall that says it should. in any case file this idea somewhere.. :-) Don't know here either. I looked at the lists and hackers seemed closest. I'll bcc current. Someone could maybe todo-wiki this thread as low hanging fruit. Cheers. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Re: Jails: Setting different times in jails
Why on earth would you want this? Warner On Jul 7, 2011, at 2:31 AM, grarpamp wrote: possibly achievable in libc? I don't know. Where else would it be done? stat, utimes, gettimeofday, clock_gettime, adjtime, etc and their variations. I've not checked what currently happens, but I don't think root in a jail should be able to set any kernel time parameters, absent a syscall that says it should. in any case file this idea somewhere.. :-) Don't know here either. I looked at the lists and hackers seemed closest. I'll bcc current. Someone could maybe todo-wiki this thread as low hanging fruit. Cheers. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Re: Jails: Setting different times in jails
possibly achievable in libc? I don't know. Where else would it be done? stat, utimes, gettimeofday, clock_gettime, adjtime, etc and their variations. I've not checked what currently happens, but I don't think root in a jail should be able to set any kernel time parameters, absent a syscall that says it should. in any case file this idea somewhere.. :-) Don't know here either. I looked at the lists and hackers seemed closest. I'll bcc current. Someone could maybe todo-wiki this thread as low hanging fruit. Cheers. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Jails: Setting different times in jails
Would be nice to be able to set different times in different jails. All jails would tick in step with the system. But each jail could have it's birthtime set specifically via jail(8), jail(2), etc. Either by specification of a specific time, or an offset from the current true system time. ie: jail(8): -t [-|+]seconds Child jails would offset from their parent, not the system. Internally, gettimeofday, filesystem timestamps, and any other userland interfaces would be hooked and adjusted by referencing a table of jail ID's and their offsets. Similar to how setting TZ or /etc/localtime effects a timezone offset. But transparent and undetectable to the jail unless set as visible by the invoker. Useful for creating alternate histories, testing time dependant protocols and applications, forensics, pen testing, etc. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Re: Jails: Setting different times in jails
On 7/3/11 1:16 AM, grarpamp wrote: Would be nice to be able to set different times in different jails. All jails would tick in step with the system. But each jail could have it's birthtime set specifically via jail(8), jail(2), etc. Either by specification of a specific time, or an offset from the current true system time. ie: jail(8): -t [-|+]seconds Child jails would offset from their parent, not the system. Internally, gettimeofday, filesystem timestamps, and any other userland interfaces would be hooked and adjusted by referencing a table of jail ID's and their offsets. Similar to how setting TZ or /etc/localtime effects a timezone offset. But transparent and undetectable to the jail unless set as visible by the invoker. Useful for creating alternate histories, testing time dependant protocols and applications, forensics, pen testing, etc. possibly achievable in libc? in any case file this idea somewhere.. :-) ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
