svn commit: r314429 - in head/sys: amd64/amd64 i386/i386

[Conrad Meyer]

Thanks!

On Tue, Feb 28, 2017 at 2:54 PM, Konstantin Belousov <kib at freebsd.org> wrote:
> Author: kib
> Date: Tue Feb 28 22:54:52 2017
> New Revision: 314429
> URL: https://svnweb.freebsd.org/changeset/base/314429
>
> Log:
>   Initialize pcb_save for thread0.
>
>   Otherwise kernel traps on NULL dereference if fpu_kern(9) is used from the
>   thread0 context.
>
>   Reported by:  cem
>   Reviewed by:  cem, jhb
>   Sponsored by: The FreeBSD Foundation
>   MFC after:    1 week
>
> Modified:
>   head/sys/amd64/amd64/machdep.c
>   head/sys/i386/i386/machdep.c
>
> Modified: head/sys/amd64/amd64/machdep.c
> ==============================================================================
> --- head/sys/amd64/amd64/machdep.c      Tue Feb 28 22:49:45 2017        (r314428)
> +++ head/sys/amd64/amd64/machdep.c      Tue Feb 28 22:54:52 2017        (r314429)
> @@ -1734,6 +1734,7 @@ hammer_time(u_int64_t modulep, u_int64_t
>          * area.
>          */
>         thread0.td_pcb = get_pcb_td(&thread0);
> +       thread0.td_pcb->pcb_save = get_pcb_user_save_td(&thread0);
>         bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size);
>         if (use_xsave) {
>                 xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) +
>
> Modified: head/sys/i386/i386/machdep.c
> ==============================================================================
> --- head/sys/i386/i386/machdep.c        Tue Feb 28 22:49:45 2017        (r314428)
> +++ head/sys/i386/i386/machdep.c        Tue Feb 28 22:54:52 2017        (r314429)
> @@ -2420,6 +2420,7 @@ init386(int first)
>          * area.
>          */
>         thread0.td_pcb = get_pcb_td(&thread0);
> +       thread0.td_pcb->pcb_save = get_pcb_user_save_td(&thread0);
>         bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size);
>         if (use_xsave) {
>                 xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) +
>