Patch "VMCI: Fix possible memcpy() run-time warning in vmci_datagram_invoke_guest_handler()" has been added to the 6.8-stable tree

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This is a note to let you know that I've just added the patch titled

    VMCI: Fix possible memcpy() run-time warning in vmci_datagram_invoke_guest_handler()

to the 6.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     vmci-fix-possible-memcpy-run-time-warning-in-vmci_datagram_invoke_guest_handler.patch
and it can be found in the queue-6.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From e606e4b71798cc1df20e987dde2468e9527bd376 Mon Sep 17 00:00:00 2001
From: Vasiliy Kovalev <kovalev@xxxxxxxxxxxx>
Date: Mon, 19 Feb 2024 13:53:15 +0300
Subject: VMCI: Fix possible memcpy() run-time warning in vmci_datagram_invoke_guest_handler()

From: Vasiliy Kovalev <kovalev@xxxxxxxxxxxx>

commit e606e4b71798cc1df20e987dde2468e9527bd376 upstream.

The changes are similar to those given in the commit 19b070fefd0d
("VMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()").

Fix filling of the msg and msg_payload in dg_info struct, which prevents a
possible "detected field-spanning write" of memcpy warning that is issued
by the tracking mechanism __fortify_memcpy_chk.

Signed-off-by: Vasiliy Kovalev <kovalev@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240219105315.76955-1-kovalev@xxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/misc/vmw_vmci/vmci_datagram.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/misc/vmw_vmci/vmci_datagram.c
+++ b/drivers/misc/vmw_vmci/vmci_datagram.c
@@ -378,7 +378,8 @@ int vmci_datagram_invoke_guest_handler(s
 
 		dg_info->in_dg_host_queue = false;
 		dg_info->entry = dst_entry;
-		memcpy(&dg_info->msg, dg, VMCI_DG_SIZE(dg));
+		dg_info->msg = *dg;
+		memcpy(&dg_info->msg_payload, dg + 1, dg->payload_size);
 
 		INIT_WORK(&dg_info->work, dg_delayed_dispatch);
 		schedule_work(&dg_info->work);


Patches currently in stable-queue which might be from kovalev@xxxxxxxxxxxx are

queue-6.8/vmci-fix-possible-memcpy-run-time-warning-in-vmci_datagram_invoke_guest_handler.patch




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