da...@l8s.co.uk said: > I presume the panic was in the 'return to user' sequence?
Yes, in the iret. > Does it now SIGSEGV the program? Yes, which is a bit strange because this happened before even the first instruction was fetched, and no user-supplied data are involved (as opposed to setmcontext). It was entirely the kernel's fault, so a panic would be only fair. > (putting in the kernel %cs might leave you running user code with > kernel privelege) This couldn't happen here because the CPL=3 is set together with the CS descriptor, so one should get a GPF on any attempt to use a kernel descriptor. best regards Matthias ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzende des Aufsichtsrats: MinDir'in Baerbel Brumme-Bothe Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender), Dr. Ulrich Krafft (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Prof. Dr. Sebastian M. Schmidt ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------
