increase / decrease the securelevel without boot

[suporte dsgx]

i saw somewhere a fix to apply into /usr/src to allow increase and decrease the securelevel without booting but i don't know where's the page cause i didn't mark it :( the reason that i need this is for chflag .. basicly cause im working creating jail enviroments .. and when user cancel the jail .. i got a bunch of files with chflags that  i gotta remove .. and with securelevel=1 .. the chflags gives permission denied even with noschg ..with superuser over the primary ip ..
well if anybody know's where's the page that includes this patch would help me a bunch thx