5.10-stable review patch. If anyone has any objections, please let me know.
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From: Vasiliy Kovalev kovalev@altlinux.org
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@altlinux.org Link: https://lore.kernel.org/r/20240219105315.76955-1-kovalev@altlinux.org Signed-off-by: Kees Cook keescook@chromium.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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);