Author: kib
Date: Tue Aug 22 18:15:47 2017
New Revision: 322799
URL: https://svnweb.freebsd.org/changeset/base/322799
Log:
Ensure that fs/gs bases are stored in pcb before copying the pcb for
new process or thread.
Reported and tested by: ae, dhw
Sponsored by: The FreeBSD Foundation
MFC after: 20 days
Modified:
head/sys/amd64/amd64/vm_machdep.c
Modified: head/sys/amd64/amd64/vm_machdep.c
==============================================================================
--- head/sys/amd64/amd64/vm_machdep.c Tue Aug 22 17:57:34 2017
(r322798)
+++ head/sys/amd64/amd64/vm_machdep.c Tue Aug 22 18:15:47 2017
(r322799)
@@ -172,6 +172,7 @@ cpu_fork(struct thread *td1, struct proc *p2, struct t
/* Ensure that td1's pcb is up to date. */
fpuexit(td1);
+ update_pcb_bases(td1->td_pcb);
/* Point the pcb to the top of the stack */
pcb2 = get_pcb_td(td2);
@@ -433,6 +434,7 @@ cpu_copy_thread(struct thread *td, struct thread *td0)
* Those not loaded individually below get their default
* values here.
*/
+ update_pcb_bases(td0->td_pcb);
bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
clear_pcb_flags(pcb2, PCB_FPUINITDONE | PCB_USERFPUINITDONE |
PCB_KERNFPU);
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