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KVM: Explicitly initialize all fields at the start of kvm_vcpu_map()

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Explicitly initialize the entire kvm_host_map structure when mapping a
pfn, as some callers declare their struct on the stack, i.e. don't
zero-initialize the struct, which makes the map->hva in kvm_vcpu_unmap()
*very* suspect.

Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20241010182427.1434605-22-seanjc@google.com>
This commit is contained in:
Sean Christopherson 2024-10-10 11:23:23 -07:00 committed by Paolo Bonzini
parent 0b139b877b
commit 5488499f9c
1 changed files with 10 additions and 18 deletions
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28
virt/kvm/kvm_main.c
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@ -3061,32 +3061,24 @@ void kvm_release_pfn(kvm_pfn_t pfn, bool dirty)
int kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map)
{
kvm_pfn_t pfn;
void *hva = NULL;
struct page *page = KVM_UNMAPPED_PAGE;
map->page = KVM_UNMAPPED_PAGE;
map->hva = NULL;
map->gfn = gfn;
pfn = gfn_to_pfn(vcpu->kvm, gfn);
if (is_error_noslot_pfn(pfn))
map->pfn = gfn_to_pfn(vcpu->kvm, gfn);
if (is_error_noslot_pfn(map->pfn))
return -EINVAL;
if (pfn_valid(pfn)) {
page = pfn_to_page(pfn);
hva = kmap(page);
if (pfn_valid(map->pfn)) {
map->page = pfn_to_page(map->pfn);
map->hva = kmap(map->page);
#ifdef CONFIG_HAS_IOMEM
} else {
hva = memremap(pfn_to_hpa(pfn), PAGE_SIZE, MEMREMAP_WB);
map->hva = memremap(pfn_to_hpa(map->pfn), PAGE_SIZE, MEMREMAP_WB);
#endif
}
if (!hva)
return -EFAULT;
map->page = page;
map->hva = hva;
map->pfn = pfn;
map->gfn = gfn;
return 0;
return map->hva ? 0 : -EFAULT;
}
EXPORT_SYMBOL_GPL(kvm_vcpu_map);