On Wed, Jun 03, 2020 at 02:23:08PM +0800, Jason Wang wrote:
OK so points:BTW now I re-read it I don't understand __vhost_get_user_slow:
static void __user *__vhost_get_user_slow(struct vhost_virtqueue *vq,
void __user *addr, unsigned int size,
ret = translate_desc(vq, (u64)(uintptr_t)addr, size, vq->iotlb_iov,
how does this work? how can we cast a pointer to guest address without
adding any offsets?
I'm not sure I get you here. What kind of offset did you mean?
1. type argument seems unused. Right?
2. Second argument to translate_desc is a GPA, isn't it?
Here we cast a userspace address to this type. What if it
matches a valid GPA by mistake?