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) +
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