Check flags when memslot is registered from userspace as Avi's suggestion
Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
---
virt/kvm/kvm_main.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 02cb440..6a7756c 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -686,6 +686,14 @@ void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new)
slots->generation++;
}
+static int check_memory_region_flags(struct kvm_userspace_memory_region *mem)
+{
+ if (mem->flags & ~KVM_MEM_LOG_DIRTY_PAGES)
+ return -EINVAL;
+
+ return 0;
+}
+
/*
* Allocate some memory and give it an address in the guest physical address
* space.
@@ -706,6 +714,10 @@ int __kvm_set_memory_region(struct kvm *kvm,
struct kvm_memory_slot old, new;
struct kvm_memslots *slots, *old_memslots;
+ r = check_memory_region_flags(mem);
+ if (r)
+ goto out;
+
r = -EINVAL;
/* General sanity checks */
if (mem->memory_size & (PAGE_SIZE - 1))
--
1.7.7.6
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