I've got a CentOS setup with UEFI Secure Boot turned on. I'm working on debugging a set of BIOS tools that were developed quite some time ago. However when Secure Boot is turned on it appears user applications are not allow to get higher privilege levels any more.
Essentially I have a kernel module that maps a virtual to physical memory buffer which is used to communicate to the BIOS. The buffer is setup and a software SMI is called so the BIOS can retrieve it, process it, and put the results back into the buffer.
I'm trying to figure out how this can still be done with Secure Boot enabled? The kernel module can still setup the buffer, but it appears like I'm unable to call into my character device setup by the kernel module.
Any ideas?