KVM: fix KVM_CLEAR_DIRTY_LOG for memory slots of unaligned size

If a memory slot's size is not a multiple of 64 pages (256K), then
the KVM_CLEAR_DIRTY_LOG API is unusable: clearing the final 64 pages
either requires the requested page range to go beyond memslot->npages,
or requires log->num_pages to be unaligned, and kvm_clear_dirty_log_protect
requires log->num_pages to be both in range and aligned.

To allow this case, allow log->num_pages not to be a multiple of 64 if
it ends exactly on the last page of the slot.

Reported-by: Peter Xu <peterx@redhat.com>
Fixes: 98938aa8edd6 ("KVM: validate userspace input in kvm_clear_dirty_log_protect()", 2019-01-02)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 7f3ebc9e7cee8fac5467ae0534b9b0592332dc52..64b38dfcc243964bfdccc905908c1d39b965817d 100644 (file)
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -3830,8 +3830,9 @@ The ioctl clears the dirty status of pages in a memory slot, according to
 the bitmap that is passed in struct kvm_clear_dirty_log's dirty_bitmap
 field.  Bit 0 of the bitmap corresponds to page "first_page" in the
 memory slot, and num_pages is the size in bits of the input bitmap.
-Both first_page and num_pages must be a multiple of 64.  For each bit
-that is set in the input bitmap, the corresponding page is marked "clean"
+first_page must be a multiple of 64; num_pages must also be a multiple of
+64 unless first_page + num_pages is the size of the memory slot.  For each
+bit that is set in the input bitmap, the corresponding page is marked "clean"
 in KVM's dirty bitmap, and dirty tracking is re-enabled for that page
 (for example via write-protection, or by clearing the dirty bit in
 a page table entry).

diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c
index 4715cfba20dce6b58f1141bcee97680dfd9aa35f..93f99c6b7d79ee11964457b5a845cef4380bab27 100644 (file)
--- a/tools/testing/selftests/kvm/dirty_log_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_test.c
@@ -288,8 +288,11 @@ static void run_test(enum vm_guest_mode mode, unsigned long iterations,
 #endif
        max_gfn = (1ul << (guest_pa_bits - guest_page_shift)) - 1;
        guest_page_size = (1ul << guest_page_shift);
-       /* 1G of guest page sized pages */
-       guest_num_pages = (1ul << (30 - guest_page_shift));
+       /*
+        * A little more than 1G of guest page sized pages.  Cover the
+        * case where the size is not aligned to 64 pages.
+        */
+       guest_num_pages = (1ul << (30 - guest_page_shift)) + 3;
        host_page_size = getpagesize();
        host_num_pages = (guest_num_pages * guest_page_size) / host_page_size +
                         !!((guest_num_pages * guest_page_size) % host_page_size);
@@ -359,7 +362,7 @@ static void run_test(enum vm_guest_mode mode, unsigned long iterations,
                kvm_vm_get_dirty_log(vm, TEST_MEM_SLOT_INDEX, bmap);
 #ifdef USE_CLEAR_DIRTY_LOG
                kvm_vm_clear_dirty_log(vm, TEST_MEM_SLOT_INDEX, bmap, 0,
-                                      DIV_ROUND_UP(host_num_pages, 64) * 64);
+                                      host_num_pages);
 #endif
                vm_dirty_log_verify(bmap);
                iteration++;

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index dc8edc97ba850384680b56f88063f61bebfc96c8..a704d1f9bd962e99d3b6fb927cbf0d3574dc1f41 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1240,7 +1240,7 @@ int kvm_clear_dirty_log_protect(struct kvm *kvm,
        if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
                return -EINVAL;
 
-       if ((log->first_page & 63) || (log->num_pages & 63))
+       if (log->first_page & 63)
                return -EINVAL;
 
        slots = __kvm_memslots(kvm, as_id);
@@ -1253,8 +1253,9 @@ int kvm_clear_dirty_log_protect(struct kvm *kvm,
        n = kvm_dirty_bitmap_bytes(memslot);
 
        if (log->first_page > memslot->npages ||
-           log->num_pages > memslot->npages - log->first_page)
-                       return -EINVAL;
+           log->num_pages > memslot->npages - log->first_page ||
+           (log->num_pages < memslot->npages - log->first_page && (log->num_pages & 63)))
+           return -EINVAL;
 
        *flush = false;
        dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot);