[RFC PATCH] VMCI: Silence memcpy() run-time false positive warning

[Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>]

Syzkaller hit 'WARNING in dg_dispatch_as_host' bug.

memcpy: detected field-spanning write (size 56) of single field "&dg_info->msg"
at drivers/misc/vmw_vmci/vmci_datagram.c:237 (size 24)

WARNING: CPU: 0 PID: 1555 at drivers/misc/vmw_vmci/vmci_datagram.c:237
dg_dispatch_as_host+0x88e/0xa60 drivers/misc/vmw_vmci/vmci_datagram.c:237

Some code commentry, based on my understanding:

544 #define VMCI_DG_SIZE(_dg) (VMCI_DG_HEADERSIZE + (size_t)(_dg)->payload_size)
/// This is 24 + payload_size

memcpy(&dg_info->msg, dg, dg_size);
	Destination = dg_info->msg ---> this is a 24 byte
					structure(struct vmci_datagram)
	Source = dg --> this is a 24 byte structure (struct vmci_datagram)
	Size = dg_size = 24 + payload_size


{payload_size = 56-24 =32} -- Syzkaller managed to set payload_size to 32.

 35 struct delayed_datagram_info {
 36         struct datagram_entry *entry;
 37         struct work_struct work;
 38         bool in_dg_host_queue;
 39         /* msg and msg_payload must be together. */
 40         struct vmci_datagram msg;
 41         u8 msg_payload[];
 42 };

So those extra bytes of payload are copied into msg_payload[], so there
is no bug, but a run time warning is seen while fuzzing with Syzkaller.

One possible way to silence the warning is to split the memcpy() into
two parts -- one -- copying the msg and second taking care of payload.

Reported-by: syzkaller <syzkaller@googlegroups.com>
Suggested-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
---
This patch is only tested with the C reproducer, not any testing
specific to driver is done.
---
 drivers/misc/vmw_vmci/vmci_datagram.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/vmw_vmci/vmci_datagram.c b/drivers/misc/vmw_vmci/vmci_datagram.c
index f50d22882476..b43661590f56 100644
--- a/drivers/misc/vmw_vmci/vmci_datagram.c
+++ b/drivers/misc/vmw_vmci/vmci_datagram.c
@@ -216,6 +216,7 @@ static int dg_dispatch_as_host(u32 context_id, struct vmci_datagram *dg)
 		if (dst_entry->run_delayed ||
 		    dg->src.context == VMCI_HOST_CONTEXT_ID) {
 			struct delayed_datagram_info *dg_info;
+			size_t payload_size = dg_size - VMCI_DG_HEADERSIZE;
 
 			if (atomic_add_return(1, &delayed_dg_host_queue_size)
 			    == VMCI_MAX_DELAYED_DG_HOST_QUEUE_SIZE) {
@@ -234,7 +235,8 @@ static int dg_dispatch_as_host(u32 context_id, struct vmci_datagram *dg)
 
 			dg_info->in_dg_host_queue = true;
 			dg_info->entry = dst_entry;
-			memcpy(&dg_info->msg, dg, dg_size);
+			memcpy(&dg_info->msg, dg, VMCI_DG_HEADERSIZE);
+			memcpy(&dg_info->msg_payload, dg + 1, payload_size);
 
 			INIT_WORK(&dg_info->work, dg_delayed_dispatch);
 			schedule_work(&dg_info->work);
-- 
2.42.0