From fcbd26d33dfa40496b6d82973bc49f95e6df21f9 Mon Sep 17 00:00:00 2001 From: Benjamin Berg Date: Sun, 3 Nov 2024 22:28:51 +0100 Subject: [PATCH] um: virtio_uml: send SET_MEM_TABLE message with the exact size The rust based userspace vhost devices are very strict and will not accept the message if it is longer than required. So, only include the data for the first memory region. Signed-off-by: Benjamin Berg Link: https://patch.msgid.link/20241103212854.1436046-2-benjamin@sipsolutions.net Signed-off-by: Johannes Berg --- arch/um/drivers/virtio_uml.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c index 4d3e9b9f5b614..c602892f329f5 100644 --- a/arch/um/drivers/virtio_uml.c +++ b/arch/um/drivers/virtio_uml.c @@ -623,7 +623,7 @@ static int vhost_user_set_mem_table(struct virtio_uml_device *vu_dev) { struct vhost_user_msg msg = { .header.request = VHOST_USER_SET_MEM_TABLE, - .header.size = sizeof(msg.payload.mem_regions), + .header.size = offsetof(typeof(msg.payload.mem_regions), regions[1]), .payload.mem_regions.num = 1, }; unsigned long reserved = uml_reserved - uml_physmem; -- 2.39.5