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Initialize pcb_save for thread0.

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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
This commit is contained in:
kib 2017-02-28 22:54:52 +00:00
parent 3d53fa4bc3
commit 06450fe6c4
2 changed files with 2 additions and 0 deletions
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1
sys/amd64/amd64/machdep.c
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@ -1734,6 +1734,7 @@ hammer_time(u_int64_t modulep, u_int64_t physfree)
* 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) +

1
sys/i386/i386/machdep.c
View File

@ -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) +