KVM: fix the handling of dirty bitmaps to avoid overflows

Int is not long enough to store the size of a dirty bitmap.

This patch fixes this problem with the introduction of a wrapper
function to calculate the sizes of dirty bitmaps.

Note: in mark_page_dirty(), we have to consider the fact that
  __set_bit() takes the offset as int, not long.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

3 files changed, 11 insertions, 8 deletions

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index 73c5c2b05f64..7f3c0a2e60cd 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1802,7 +1802,8 @@ static int kvm_ia64_sync_dirty_log(struct kvm *kvm,
 {
         struct kvm_memory_slot *memslot;
         int r, i;
-        long n, base;
+        long base;
+        unsigned long n;
         unsigned long *dirty_bitmap = (unsigned long *)(kvm->arch.vm_base +
                         offsetof(struct kvm_vm_data, kvm_mem_dirty_log));
 
@@ -1815,7 +1816,7 @@ static int kvm_ia64_sync_dirty_log(struct kvm *kvm,
         if (!memslot->dirty_bitmap)
                 goto out;
 
-        n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
+        n = kvm_dirty_bitmap_bytes(memslot);
         base = memslot->base_gfn / BITS_PER_LONG;
 
         for (i = 0; i < n/sizeof(long); ++i) {
@@ -1831,7 +1832,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
                 struct kvm_dirty_log *log)
 {
         int r;
-        int n;
+        unsigned long n;
         struct kvm_memory_slot *memslot;
         int is_dirty = 0;
 
@@ -1850,7 +1851,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
         if (is_dirty) {
                 kvm_flush_remote_tlbs(kvm);
                 memslot = &kvm->memslots->memslots[log->slot];
-                n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
+                n = kvm_dirty_bitmap_bytes(memslot);
                 memset(memslot->dirty_bitmap, 0, n);
         }
         r = 0;
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 25da07fd9f77..604af29b71ed 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -1004,7 +1004,8 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
         struct kvm_vcpu *vcpu;
         ulong ga, ga_end;
         int is_dirty = 0;
-        int r, n;
+        int r;
+        unsigned long n;
 
         mutex_lock(&kvm->slots_lock);
 
@@ -1022,7 +1023,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
                 kvm_for_each_vcpu(n, vcpu, kvm)
                         kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
 
-                n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
+                n = kvm_dirty_bitmap_bytes(memslot);
                 memset(memslot->dirty_bitmap, 0, n);
         }
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9ad3d064c781..45aa90f8cc57 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2612,8 +2612,9 @@ static int kvm_vm_ioctl_reinject(struct kvm *kvm,
 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
                                       struct kvm_dirty_log *log)
 {
-        int r, n, i;
+        int r, i;
         struct kvm_memory_slot *memslot;
+        unsigned long n;
         unsigned long is_dirty = 0;
         unsigned long *dirty_bitmap = NULL;
 
@@ -2628,7 +2629,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
         if (!memslot->dirty_bitmap)
                 goto out;
 
-        n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
+        n = kvm_dirty_bitmap_bytes(memslot);
 
         r = -ENOMEM;
         dirty_bitmap = vmalloc(n);