Date: Mon, 25 Oct 2021 12:47:45 GMT From: Mark Johnston <markj@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 66e63d0cad4d - stable/13 - amd64: Zero the PML5 PTI page when initializing a pmap Message-ID: <202110251247.19PCljwK007303@gitrepo.freebsd.org>
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The branch stable/13 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=66e63d0cad4d92cca747a2f62517ca34a126bef2 commit 66e63d0cad4d92cca747a2f62517ca34a126bef2 Author: Mark Johnston <markj@FreeBSD.org> AuthorDate: 2021-10-18 13:29:20 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2021-10-25 12:46:43 +0000 amd64: Zero the PML5 PTI page when initializing a pmap The root page is not zeroed at allocation time since with 4-level tables each entry is copied from a template. However, with 5-level tables only a single entry is filled, so the rest need to be cleared. Reported by: alc Reviewed by: alc, kib Sponsored by: The FreeBSD Foundation (cherry picked from commit b0423d0f5eec89bd6c11c32649603031e3dbbfe1) --- sys/amd64/amd64/pmap.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c index 83f2a4c88bf7..43ed0f7b7411 100644 --- a/sys/amd64/amd64/pmap.c +++ b/sys/amd64/amd64/pmap.c @@ -4186,6 +4186,7 @@ pmap_pinit_pml5_pti(vm_page_t pml5pgu) pml5_entry_t *pm_pml5u; pm_pml5u = (pml5_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(pml5pgu)); + pagezero(pm_pml5u); /* * Add pml5 entry at top of KVA pointing to existing pml4 pti
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