KVM: fix the handling of dirty bitmaps to avoid overflows

(Cherry-picked from commit 87bf6e7de1134f48681fd2ce4b7c1ec45458cb6d)

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

5 files changed, 23 insertions, 13 deletions

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index 5fdeec5fddcf..d76279aaaea1 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1794,7 +1794,8 @@ 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));
 
@@ -1807,7 +1808,7 @@ 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) {
@@ -1823,7 +1824,7 @@ 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;
 
@@ -1841,7 +1842,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
         if (is_dirty) {
                 kvm_flush_remote_tlbs(kvm);
                 memslot = &kvm->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 3e294bd9b8c6..e6dc59558fc1 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -848,7 +848,8 @@ 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;
 
         down_write(&kvm->slots_lock);
 
@@ -866,7 +867,7 @@ 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 cd3dc54e2fc4..e0f010e53f63 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2343,7 +2343,7 @@ 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;
 
@@ -2359,7 +2359,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
                 kvm_mmu_slot_remove_write_access(kvm, log->slot);
                 spin_unlock(&kvm->mmu_lock);
                 memslot = &kvm->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/include/linux/kvm_host.h b/include/linux/kvm_host.h
index bd5a616d9373..ddb7d5840de8 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -116,6 +116,11 @@ struct kvm_memory_slot {
         int user_alloc;
 };
 
+static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
+{
+        return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
+}
+
 struct kvm_kernel_irq_routing_entry {
         u32 gsi;
         u32 type;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a944be392d6e..9dd98cb25573 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -636,7 +636,7 @@ skip_lpage:
 
         /* Allocate page dirty bitmap if needed */
         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
-                unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
+                unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new);
 
                 new.dirty_bitmap = vmalloc(dirty_bytes);
                 if (!new.dirty_bitmap)
@@ -719,7 +719,7 @@ int kvm_get_dirty_log(struct kvm *kvm,
 {
         struct kvm_memory_slot *memslot;
         int r, i;
-        int n;
+        unsigned long n;
         unsigned long any = 0;
 
         r = -EINVAL;
@@ -731,7 +731,7 @@ int kvm_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);
 
         for (i = 0; !any && i < n/sizeof(long); ++i)
                 any = memslot->dirty_bitmap[i];
@@ -1073,10 +1073,13 @@ void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
         memslot = gfn_to_memslot_unaliased(kvm, gfn);
         if (memslot && memslot->dirty_bitmap) {
                 unsigned long rel_gfn = gfn - memslot->base_gfn;
+                unsigned long *p = memslot->dirty_bitmap +
+                                        rel_gfn / BITS_PER_LONG;
+                int offset = rel_gfn % BITS_PER_LONG;
 
                 /* avoid RMW */
-                if (!generic_test_le_bit(rel_gfn, memslot->dirty_bitmap))
-                        generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
+                if (!generic_test_le_bit(offset, p))
+                        generic___set_le_bit(offset, p);
         }
 }