vhost: return bool from *_access_ok() functions
Currently vhost *_access_ok() functions return int. This is error-prone because there are two popular conventions: 1. 0 means failure, 1 means success 2. -errno means failure, 0 means success Although vhost mostly uses #1, it does not do so consistently. umem_access_ok() uses #2. This patch changes the return type from int to bool so that false means failure and true means success. This eliminates a potential source of errors. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -641,14 +641,14 @@ void vhost_dev_cleanup(struct vhost_dev *dev)
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}
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EXPORT_SYMBOL_GPL(vhost_dev_cleanup);
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static int log_access_ok(void __user *log_base, u64 addr, unsigned long sz)
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static bool log_access_ok(void __user *log_base, u64 addr, unsigned long sz)
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{
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u64 a = addr / VHOST_PAGE_SIZE / 8;
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/* Make sure 64 bit math will not overflow. */
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if (a > ULONG_MAX - (unsigned long)log_base ||
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a + (unsigned long)log_base > ULONG_MAX)
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return 0;
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return false;
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return access_ok(VERIFY_WRITE, log_base + a,
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(sz + VHOST_PAGE_SIZE * 8 - 1) / VHOST_PAGE_SIZE / 8);
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@ -661,30 +661,30 @@ static bool vhost_overflow(u64 uaddr, u64 size)
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}
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/* Caller should have vq mutex and device mutex. */
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static int vq_memory_access_ok(void __user *log_base, struct vhost_umem *umem,
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static bool vq_memory_access_ok(void __user *log_base, struct vhost_umem *umem,
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int log_all)
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{
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struct vhost_umem_node *node;
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if (!umem)
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return 0;
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return false;
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list_for_each_entry(node, &umem->umem_list, link) {
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unsigned long a = node->userspace_addr;
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if (vhost_overflow(node->userspace_addr, node->size))
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return 0;
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return false;
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if (!access_ok(VERIFY_WRITE, (void __user *)a,
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node->size))
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return 0;
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return false;
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else if (log_all && !log_access_ok(log_base,
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node->start,
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node->size))
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return 0;
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return false;
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}
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return 1;
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return true;
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}
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static inline void __user *vhost_vq_meta_fetch(struct vhost_virtqueue *vq,
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@ -701,13 +701,13 @@ static inline void __user *vhost_vq_meta_fetch(struct vhost_virtqueue *vq,
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/* Can we switch to this memory table? */
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/* Caller should have device mutex but not vq mutex */
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static int memory_access_ok(struct vhost_dev *d, struct vhost_umem *umem,
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static bool memory_access_ok(struct vhost_dev *d, struct vhost_umem *umem,
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int log_all)
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{
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int i;
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for (i = 0; i < d->nvqs; ++i) {
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int ok;
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bool ok;
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bool log;
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mutex_lock(&d->vqs[i]->mutex);
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@ -717,12 +717,12 @@ static int memory_access_ok(struct vhost_dev *d, struct vhost_umem *umem,
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ok = vq_memory_access_ok(d->vqs[i]->log_base,
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umem, log);
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else
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ok = 1;
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ok = true;
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mutex_unlock(&d->vqs[i]->mutex);
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if (!ok)
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return 0;
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return false;
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}
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return 1;
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return true;
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}
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static int translate_desc(struct vhost_virtqueue *vq, u64 addr, u32 len,
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@ -959,21 +959,21 @@ static void vhost_iotlb_notify_vq(struct vhost_dev *d,
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spin_unlock(&d->iotlb_lock);
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}
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static int umem_access_ok(u64 uaddr, u64 size, int access)
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static bool umem_access_ok(u64 uaddr, u64 size, int access)
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{
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unsigned long a = uaddr;
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/* Make sure 64 bit math will not overflow. */
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if (vhost_overflow(uaddr, size))
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return -EFAULT;
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return false;
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if ((access & VHOST_ACCESS_RO) &&
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!access_ok(VERIFY_READ, (void __user *)a, size))
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return -EFAULT;
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return false;
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if ((access & VHOST_ACCESS_WO) &&
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!access_ok(VERIFY_WRITE, (void __user *)a, size))
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return -EFAULT;
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return 0;
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return false;
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return true;
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}
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static int vhost_process_iotlb_msg(struct vhost_dev *dev,
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@ -988,7 +988,7 @@ static int vhost_process_iotlb_msg(struct vhost_dev *dev,
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ret = -EFAULT;
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break;
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}
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if (umem_access_ok(msg->uaddr, msg->size, msg->perm)) {
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if (!umem_access_ok(msg->uaddr, msg->size, msg->perm)) {
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ret = -EFAULT;
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break;
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}
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@ -1135,7 +1135,7 @@ static int vhost_iotlb_miss(struct vhost_virtqueue *vq, u64 iova, int access)
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return 0;
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}
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static int vq_access_ok(struct vhost_virtqueue *vq, unsigned int num,
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static bool vq_access_ok(struct vhost_virtqueue *vq, unsigned int num,
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struct vring_desc __user *desc,
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struct vring_avail __user *avail,
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struct vring_used __user *used)
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@ -1161,7 +1161,7 @@ static void vhost_vq_meta_update(struct vhost_virtqueue *vq,
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vq->meta_iotlb[type] = node;
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}
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static int iotlb_access_ok(struct vhost_virtqueue *vq,
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static bool iotlb_access_ok(struct vhost_virtqueue *vq,
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int access, u64 addr, u64 len, int type)
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{
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const struct vhost_umem_node *node;
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@ -1220,7 +1220,7 @@ EXPORT_SYMBOL_GPL(vq_iotlb_prefetch);
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/* Can we log writes? */
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/* Caller should have device mutex but not vq mutex */
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int vhost_log_access_ok(struct vhost_dev *dev)
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bool vhost_log_access_ok(struct vhost_dev *dev)
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{
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return memory_access_ok(dev, dev->umem, 1);
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}
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@ -1228,7 +1228,7 @@ EXPORT_SYMBOL_GPL(vhost_log_access_ok);
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/* Verify access for write logging. */
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/* Caller should have vq mutex and device mutex */
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static int vq_log_access_ok(struct vhost_virtqueue *vq,
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static bool vq_log_access_ok(struct vhost_virtqueue *vq,
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void __user *log_base)
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{
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size_t s = vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0;
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@ -1242,14 +1242,14 @@ static int vq_log_access_ok(struct vhost_virtqueue *vq,
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/* Can we start vq? */
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/* Caller should have vq mutex and device mutex */
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int vhost_vq_access_ok(struct vhost_virtqueue *vq)
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bool vhost_vq_access_ok(struct vhost_virtqueue *vq)
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{
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if (!vq_log_access_ok(vq, vq->log_base))
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return 0;
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return false;
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/* Access validation occurs at prefetch time with IOTLB */
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if (vq->iotlb)
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return 1;
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return true;
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return vq_access_ok(vq, vq->num, vq->desc, vq->avail, vq->used);
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}
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@ -178,8 +178,8 @@ void vhost_dev_cleanup(struct vhost_dev *);
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void vhost_dev_stop(struct vhost_dev *);
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long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, void __user *argp);
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long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp);
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int vhost_vq_access_ok(struct vhost_virtqueue *vq);
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int vhost_log_access_ok(struct vhost_dev *);
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bool vhost_vq_access_ok(struct vhost_virtqueue *vq);
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bool vhost_log_access_ok(struct vhost_dev *);
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int vhost_get_vq_desc(struct vhost_virtqueue *,
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struct iovec iov[], unsigned int iov_count,
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