Nvidia MCX621102AC-ADAT User Manual page 43

Enrolling Mellanox's x.509 Public Key on Your Systems
In order to support loading MLNX_OFED drivers when an OS supporting Secure Boot boots on a UEFI-
based system with Secure Boot enabled, the Mellanox x.509 public key should be added to the UEFI
Secure Boot key database and loaded onto the system key ring by the kernel.
Follow these steps below to add the Mellanox's x.509 public key to your system:

Prior to adding the Mellanox's x.509 public key to your system, please make sure that (1)
The 'mokutil' package is installed on your system, and (2) The system is booted in UEFI
mode.
1. Download the x.509 public key.
# wget http://www.mellanox.com/downloads/ofed/mlnx_signing_key_pub.der
2. Add the public key to the MOK list using the mokutil utility.
# mokutil --import
3. Reboot the system.
The pending MOK key enrollment request will be noticed by shim.efi and it will launch
MokManager.efi to allow you to complete the enrollment from the UEFI console. You will need to
enter the password you previously associated with this request and confirm the enrollment. Once
done, the public key is added to the MOK list, which is persistent. Once a key is in the MOK list, it
will be automatically propagated to the system key ring and subsequent will be booted when the
UEFI Secure Boot is enabled.

To see what keys have been added to the system key ring on the current boot, install the
'keyutils' package and run: #keyctl list %:.system_keyring#
Removing Signature from kernel Modules
The signature can be removed from a signed kernel module using the 'strip' utility which is provided
by the 'binutils' package. The strip utility will change the given file without saving a backup. The
operation can be undo only by resigning the kernel module. Hence, we recommend backing up a
copy prior to removing the signature.
To remove the signature from the MLNX_OFED kernel modules:
1. Remove the signature.
# rpm -qa | grep -E
| xargs rpm -ql | grep
After the signature has been removed, a massage as the below will no longer be presented
upon module loading:
mlnx_signing_key_pub.der
"kernel-ib|mlnx-ofa_kernel|iser|srp|knem|mlnx-rds|mlnx-nfsrdma|mlnx-nvme|mlnx-rdma-rxe"
"\.ko$" | xargs strip -g
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