K 10
svn:author
V 5
mdodd
K 8
svn:date
V 27
2002-09-19T18:46:25.000000Z
K 7
svn:log
V 925
From Christian Zander:

This patch addresses a bug that can cause a GPF in the kernel - if a
process makes use of i386_set_ldt to install a LDT entry, then loads
a corresponding segment descriptor into %gs, forks, and if the child
execs.

In this scenario, setregs executes user_ldt_free and then determines
how to reset the %gs register:

    /* reset %gs as well */
    if (pcb == curpcb)
        load_gs(_udatasel);
    else
        pcb->pcb_gs = _udatasel;

This is insufficient in the fork/exec case, since pcb will be equal
to curpcb when the child execs; load_gs will reset %gs to _udatasel
but it doesn't reset pcb->pcb_gs; upon return from the system call,
cpu_switch_load_gs will thus attempt to restore %gs from pcb->pcb_gs
and trigger a GPF since all LDT entries have already been cleared.

The fix is to always reset pcb->pcb_gs to _udatasel.

Submitted by:	Christian Zander <zander@minion.de>
Reviewed by:	jake

END