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KVM Xen:

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Fix a bug where KVM fails to check the validity of an incoming userspace
 virtual address and tries to activate a gfn_to_pfn_cache with a kernel address.
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Merge tag 'kvm-x86-fixes-6.10-11' of https://github.com/kvm-x86/linux into HEAD

KVM Xen:

Fix a bug where KVM fails to check the validity of an incoming userspace
virtual address and tries to activate a gfn_to_pfn_cache with a kernel address.
This commit is contained in:
Paolo Bonzini 2024-07-16 09:51:14 -04:00
commit f4501e8bc8
2 changed files with 4 additions and 1 deletions
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2
arch/x86/kvm/xen.c
View File

@ -741,7 +741,7 @@ int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
} else { } else {
void __user * hva = u64_to_user_ptr(data->u.shared_info.hva); void __user * hva = u64_to_user_ptr(data->u.shared_info.hva);
if (!PAGE_ALIGNED(hva) || !access_ok(hva, PAGE_SIZE)) { if (!PAGE_ALIGNED(hva)) {
r = -EINVAL; r = -EINVAL;
} else if (!hva) { } else if (!hva) {
kvm_gpc_deactivate(&kvm->arch.xen.shinfo_cache); kvm_gpc_deactivate(&kvm->arch.xen.shinfo_cache);

3
virt/kvm/pfncache.c
View File

@ -430,6 +430,9 @@ int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len)
int kvm_gpc_activate_hva(struct gfn_to_pfn_cache *gpc, unsigned long uhva, unsigned long len) int kvm_gpc_activate_hva(struct gfn_to_pfn_cache *gpc, unsigned long uhva, unsigned long len)
{ {
if (!access_ok((void __user *)uhva, len))
return -EINVAL;
return __kvm_gpc_activate(gpc, INVALID_GPA, uhva, len); return __kvm_gpc_activate(gpc, INVALID_GPA, uhva, len);
} }