2.
3.
1.
2.
Add the public key to the MOK list using the mokutil utility.
# mokutil --import mlnx_signing_key_pub.der
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.
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:
Remove the signature.
# rpm -qa | grep -E "kernel-ib|mlnx-ofa_kernel|iser|srp|knem|mlnx-rds|mlnx-nfsrdma|mlnx-nvme|mlnx-rdma-rxe"
| xargs rpm -ql | grep "\.ko$" | xargs strip -g
After the signature has been removed, a massage as the below will no longer be presented
upon module loading:
"Request for unknown module key 'Mellanox Technologies signing key:
61feb074fc7292f958419386ffdd9d5ca999e403' err -11"
However, please note that a similar message as the following will still be presented:
"my_module: module verification failed: signature and/or required key missing - tainting kernel"
This message is only presented once, upon first module boot that either has no signature or
whose key is not in the kernel key ring. Therefore, this message may go unnoticed. Once the
system is rebooted after unloading and reloading a kernel module, the message will appear.
(Note that this message cannot be eliminated.)
Update the initramfs on RHEL systems with the stripped modules.
mkinitrd /boot/initramfs-$(uname -r).img $(uname -r) --force
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#
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