vhost now validates each region with access_ok in calling process
context before access. Since this fails on a full 64 bit 1:1 mapping
that vhost had by default, we can't support such a mapping: users will
have to set up a table with real addresses that actually matches their
address space.
Make the default mapping empty.
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
---
drivers/vhost/vhost.c | 13 +++----------
1 files changed, 3 insertions(+), 10 deletions(-)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 33e06bf..2b65d9b 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -170,21 +170,14 @@ long vhost_dev_reset_owner(struct vhost_dev *dev)
{
struct vhost_memory *memory;
- /* Restore memory to default 1:1 mapping. */
- memory = kmalloc(offsetof(struct vhost_memory, regions) +
- 2 * sizeof *memory->regions, GFP_KERNEL);
+ /* Restore memory to default empty mapping. */
+ memory = kmalloc(offsetof(struct vhost_memory, regions), GFP_KERNEL);
if (!memory)
return -ENOMEM;
vhost_dev_cleanup(dev);
- memory->nregions = 2;
- memory->regions[0].guest_phys_addr = 1;
- memory->regions[0].userspace_addr = 1;
- memory->regions[0].memory_size = ~0ULL;
- memory->regions[1].guest_phys_addr = 0;
- memory->regions[1].userspace_addr = 0;
- memory->regions[1].memory_size = 1;
+ memory->nregions = 0;
dev->memory = memory;
return 0;
}
--
1.6.6.rc1.43.gf55cc
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