Reg : signature and/or required key missing

Greg KH greg at
Mon May 4 09:01:08 EDT 2020

On Mon, May 04, 2020 at 06:14:59PM +0530, Majji SankaraRao wrote:
> Hi,
> I got the following kernel message after inserting my sample char dev
> module into kernel version - 5.3.0-51-generic
> *[17866.747927] mychardev: module verification failed: signature and/or
> required key missing - tainting kernel*
> Please guide me how to solve this issue.

You have module signing enabled and do not have the key for that kernel
to allow it to load a module without "tainting" the kernel.  It should
work just fine, but to have that go away, build your own kernel without
that option, or with your own set of build keys.

hope this helps,

greg k-h

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