linux-kernel - Re: [PATCH] VMCI: Resource wildcard match fixed

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Date:   Tue, 2 Oct 2018 15:35:02 -0700
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jorgen Hansen <jhansen@...are.com>
Cc:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, pv-drivers@...are.com
Subject: Re: [PATCH] VMCI: Resource wildcard match fixed

On Fri, Sep 21, 2018 at 12:31:05AM -0700, Jorgen Hansen wrote:
> When adding a VMCI resource, the check for an existing entry
> would ignore that the new entry could be a wildcard. This could
> result in multiple resource entries that would match a given
> handle. One disastrous outcome of this is that the
> refcounting used to ensure that delayed callbacks for VMCI
> datagrams have run before the datagram is destroyed can be
> wrong, since the refcount could be increased on the duplicate
> entry. This in turn leads to a use after free bug. This issue
> was discovered by Hangbin Liu using KASAN and syzkaller.
> 
> Fixes: bc63dedb7d46 ("VMCI: resource object implementation")
> Reported-by: Hangbin Liu <liuhangbin@...il.com>
> Reviewed-by: Adit Ranadive <aditr@...are.com>
> Reviewed-by: Vishnu Dasa <vdasa@...are.com>
> Signed-off-by: Jorgen Hansen <jhansen@...are.com>
> ---
>  drivers/misc/vmw_vmci/vmci_driver.c   | 2 +-
>  drivers/misc/vmw_vmci/vmci_resource.c | 3 ++-
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/misc/vmw_vmci/vmci_driver.c b/drivers/misc/vmw_vmci/vmci_driver.c
> index d7eaf1eb11e7..003bfba40758 100644
> --- a/drivers/misc/vmw_vmci/vmci_driver.c
> +++ b/drivers/misc/vmw_vmci/vmci_driver.c
> @@ -113,5 +113,5 @@ module_exit(vmci_drv_exit);
>  
>  MODULE_AUTHOR("VMware, Inc.");
>  MODULE_DESCRIPTION("VMware Virtual Machine Communication Interface.");
> -MODULE_VERSION("1.1.5.0-k");
> +MODULE_VERSION("1.1.6.0-k");
>  MODULE_LICENSE("GPL v2");

You do know MODULE_VERSION means nothing, right?  Please just remove it.

thanks,

greg k-h