virtio: force vring descriptors to be allocated from lowmem
Will Deacon [Fri, 19 Oct 2012 13:03:33 +0000 (14:03 +0100)]
commit b92b1b89a33c172c075edccf6afb0edc41d851fd upstream.

Virtio devices may attempt to add descriptors to a virtqueue from atomic
context using GFP_ATOMIC allocation. This is problematic because such
allocations can fall outside of the lowmem mapping, causing virt_to_phys
to report bogus physical addresses which are subsequently passed to
userspace via the buffers for the virtual device.

This patch masks out __GFP_HIGH and __GFP_HIGHMEM from the requested
flags when allocating descriptors for a virtqueue. If an atomic
allocation is requested and later fails, we will return -ENOSPC which
will be handled by the driver.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/virtio/virtio_ring.c

index 5aa43c3..52bfd07 100644 (file)
@@ -132,6 +132,13 @@ static int vring_add_indirect(struct vring_virtqueue *vq,
        unsigned head;
        int i;
 
+       /*
+        * We require lowmem mappings for the descriptors because
+        * otherwise virt_to_phys will give us bogus addresses in the
+        * virtqueue.
+        */
+       gfp &= ~(__GFP_HIGHMEM | __GFP_HIGH);
+
        desc = kmalloc((out + in) * sizeof(struct vring_desc), gfp);
        if (!desc)
                return -ENOMEM;