115 lines
4.3 KiB
Diff
115 lines
4.3 KiB
Diff
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Date: Tue, 12 Nov 2019 16:35:06 +0000
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Subject: [08/11] x86/kvm: Introduce kvm_(un)map_gfn()
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Origin: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit?id=e36d68ec5090599058650152547d4a58ef3d79a0
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Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2019-3016
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commit 1eff70a9abd46f175defafd29bc17ad456f398a7 upstream.
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kvm_vcpu_(un)map operates on gfns from any current address space.
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In certain cases we want to make sure we are not mapping SMRAM
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and for that we can use kvm_(un)map_gfn() that we are introducing
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in this patch.
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This is part of CVE-2019-3016.
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Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
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Signed-off-by: Sasha Levin <sashal@kernel.org>
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---
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include/linux/kvm_host.h | 2 ++
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virt/kvm/kvm_main.c | 29 ++++++++++++++++++++++++-----
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2 files changed, 26 insertions(+), 5 deletions(-)
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diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
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index bef95dba14e8..303c1a6916ce 100644
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--- a/include/linux/kvm_host.h
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+++ b/include/linux/kvm_host.h
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@@ -738,8 +738,10 @@ struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn
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kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn);
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kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn);
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int kvm_vcpu_map(struct kvm_vcpu *vcpu, gpa_t gpa, struct kvm_host_map *map);
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+int kvm_map_gfn(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map);
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struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn);
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void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty);
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+int kvm_unmap_gfn(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty);
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unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn);
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unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable);
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int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, int offset,
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diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
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index 33b288469c70..8e29b2e0bf2e 100644
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--- a/virt/kvm/kvm_main.c
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+++ b/virt/kvm/kvm_main.c
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@@ -1705,12 +1705,13 @@ struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
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}
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EXPORT_SYMBOL_GPL(gfn_to_page);
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-static int __kvm_map_gfn(struct kvm_memory_slot *slot, gfn_t gfn,
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+static int __kvm_map_gfn(struct kvm_memslots *slots, gfn_t gfn,
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struct kvm_host_map *map)
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{
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kvm_pfn_t pfn;
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void *hva = NULL;
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struct page *page = KVM_UNMAPPED_PAGE;
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+ struct kvm_memory_slot *slot = __gfn_to_memslot(slots, gfn);
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if (!map)
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return -EINVAL;
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@@ -1739,14 +1740,20 @@ static int __kvm_map_gfn(struct kvm_memory_slot *slot, gfn_t gfn,
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return 0;
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}
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+int kvm_map_gfn(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map)
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+{
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+ return __kvm_map_gfn(kvm_memslots(vcpu->kvm), gfn, map);
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+}
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+EXPORT_SYMBOL_GPL(kvm_map_gfn);
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+
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int kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map)
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{
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- return __kvm_map_gfn(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, map);
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+ return __kvm_map_gfn(kvm_vcpu_memslots(vcpu), gfn, map);
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}
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EXPORT_SYMBOL_GPL(kvm_vcpu_map);
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-void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map,
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- bool dirty)
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+static void __kvm_unmap_gfn(struct kvm_memory_slot *memslot,
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+ struct kvm_host_map *map, bool dirty)
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{
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if (!map)
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return;
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@@ -1762,7 +1769,7 @@ void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map,
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#endif
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if (dirty) {
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- kvm_vcpu_mark_page_dirty(vcpu, map->gfn);
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+ mark_page_dirty_in_slot(memslot, map->gfn);
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kvm_release_pfn_dirty(map->pfn);
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} else {
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kvm_release_pfn_clean(map->pfn);
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@@ -1771,6 +1778,18 @@ void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map,
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map->hva = NULL;
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map->page = NULL;
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}
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+
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+int kvm_unmap_gfn(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty)
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+{
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+ __kvm_unmap_gfn(gfn_to_memslot(vcpu->kvm, map->gfn), map, dirty);
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(kvm_unmap_gfn);
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+
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+void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty)
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+{
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+ __kvm_unmap_gfn(kvm_vcpu_gfn_to_memslot(vcpu, map->gfn), map, dirty);
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+}
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EXPORT_SYMBOL_GPL(kvm_vcpu_unmap);
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struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
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--
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2.27.0.rc0
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