Author: kib
Date: Sat Oct 3 23:11:20 2020
New Revision: 366416
URL: https://svnweb.freebsd.org/changeset/base/366416
Log:
Fix pmap_pti_add_kva() call for doublefault stack page.
After r354889 stack got struct nmi_pcpu at top, which makes IST top
not page-aligned. Since pmap_pti_add_kva() truncates/rounds up
addresses, it erronously entered a page mapped before double fault
stack into the pti page table.
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Modified:
head/sys/amd64/amd64/pmap.c
Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c Sat Oct 3 23:07:09 2020 (r366415)
+++ head/sys/amd64/amd64/pmap.c Sat Oct 3 23:11:20 2020 (r366416)
@@ -10479,7 +10479,7 @@ pmap_pti_init(void)
sizeof(struct gate_descriptor) * NIDT, false);
CPU_FOREACH(i) {
/* Doublefault stack IST 1 */
- va = __pcpu[i].pc_common_tss.tss_ist1;
+ va = __pcpu[i].pc_common_tss.tss_ist1 + sizeof(struct nmi_pcpu);
pmap_pti_add_kva_locked(va - PAGE_SIZE, va, false);
/* NMI stack IST 2 */
va = __pcpu[i].pc_common_tss.tss_ist2 + sizeof(struct nmi_pcpu);
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