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KVM: fix missing check for memslot flags

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Check flags when memslot is registered from userspace as Avi's suggestion

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2012-08-21 10:58:13 +08:00 committed by Avi Kivity
parent 8e3d9d061b
commit a50d64d659
1 changed files with 12 additions and 0 deletions
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12
virt/kvm/kvm_main.c
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@ -678,6 +678,14 @@ 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.
@ -698,6 +706,10 @@ 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))