Date: Mon, 18 Oct 2021 14:08:09 GMT From: Mark Johnston <markj@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: b0423d0f5eec - main - amd64: Zero the PML5 PTI page when initializing a pmap Message-ID: <202110181408.19IE89dK066375@gitrepo.freebsd.org>
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The branch main has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=b0423d0f5eec89bd6c11c32649603031e3dbbfe1 commit b0423d0f5eec89bd6c11c32649603031e3dbbfe1 Author: Mark Johnston <markj@FreeBSD.org> AuthorDate: 2021-10-18 13:29:20 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2021-10-18 13:50:42 +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 MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D32525 --- 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 f1ddbe548c0f..168c9eec1b66 100644 --- a/sys/amd64/amd64/pmap.c +++ b/sys/amd64/amd64/pmap.c @@ -4293,6 +4293,7 @@ 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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