SSL Error: Unable to Open Signing Key File During Kernel Transplant on Jetson

Issue Overview

Users attempting to transplant kernel-6.6 to a Jetson device are encountering an SSL error during the kernel module installation process. Specifically, when executing the command sudo -E make modules_install, the system reports an error indicating it cannot find or open a file. The error message states: "SSL error:02001002:system library:fopen:No such file or directory: crypto/bio/bss_file.c". This issue prevents the successful installation of kernel modules, which is a critical step in the kernel transplant process.

Possible Causes

  1. Missing Signing Key File: The most likely cause of this error is the absence of a required signing key file (signing_key.pem) in the kernel source directory. This file is essential for cryptographic operations during the kernel module installation.

  2. Incorrect File Permissions: If the signing key file exists but cannot be accessed, it may be due to incorrect file permissions or ownership.

  3. Corrupted Kernel Source: In rare cases, a corrupted or incomplete kernel source download could lead to missing critical files.

  4. System Library Issues: The error message mentions a system library, which could indicate a problem with the SSL libraries on the system.

Troubleshooting Steps, Solutions & Fixes

  1. Locate the Missing Signing Key

    • Check if the signing_key.pem file exists in your kernel source directory.
    • If it’s missing, you’ll need to obtain it from a known working kernel source.
  2. Copy Signing Key from Official Kernel

    • The most reliable solution is to copy the signing key from the official kernel-5.15 source.
    • Execute the following steps:
      # Navigate to your kernel-6.6 source directory
      cd /path/to/kernel-6.6/source
      
      # Copy the signing key from the official kernel-5.15 source
      cp /path/to/official/kernel-5.15/source/signing_key.pem .
      
      # Ensure the file has the correct permissions
      chmod 644 signing_key.pem
      
  3. Verify File Integrity

    • After copying the signing key, verify its integrity:
      md5sum signing_key.pem
      
    • Compare the output with the MD5 sum of the original file to ensure it was copied correctly.
  4. Retry Kernel Module Installation

    • Once the signing key is in place, attempt the module installation again:
      sudo -E make modules_install
      
  5. Check System SSL Libraries

    • If the error persists, verify the integrity of your system’s SSL libraries:
      sudo apt-get install --reinstall libssl-dev
      
  6. Kernel Source Integrity

    • If issues continue, consider re-downloading or updating your kernel source:
      git clone https://github.com/torvalds/linux.git
      cd linux
      git checkout v6.6
      
  7. Consult Jetson Documentation

    • Review the official NVIDIA Jetson documentation for any specific requirements or known issues related to kernel transplants.
  8. Community Support

    • If the problem persists, consider reaching out to the NVIDIA Jetson developer forums or the Linux kernel mailing list for more specialized assistance.

By following these steps, users should be able to resolve the SSL error and successfully complete the kernel module installation process during the kernel-6.6 transplant on their Jetson device.

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