4

I am having problems while loading/installing a kernel module. The kernel module builds successfully, but whenever I try to make module_install, the kernel seems to fail to load. It leaves the below error message :-

At main.c:158:
    - SSL error:02001002:system library:fopen:No such file or directory: bss_file.c:175
    - SSL error:2006D080:BIO routines:BIO_new_file:no such file: bss_file.c:178 sign-file: certs/signing_key.pem: No such file or directory
    DEPMOD 4.10.0-20-generic

I have read about this problem and realized that the kernel has now started loading only properly signed modules. I find that the kernel source directory /usr/src/<linux version>/certs in my system does not have the signing_key.pem private key file because of which I see this error.

What should I do ? Can I manually generate a signing_key.pem file and use it further ? What would be some good methods to do so ? Will generating a private key/certificate file using openssl.cnf help me in this regard ? Or should I avoid using signed modules at all and try loading the modules as it is without any verification ?

I am using Ubuntu 17.04 with kernel 4.10.0-20-generic.

  • I too am experiencing this. Even though I seem to compile everything fine, the kernel driver never gets loaded. – ben-Nabiy Derush Aug 13 '17 at 21:14
2

In your linux kernel root folder that you're compiling go to the certs folder and run:

openssl req -new -nodes -utf8 -sha512 -days 36500 -batch -x509 -config x509.genkey -outform DER -out signing_key.x509 -keyout signing_key.pem

Where x509.genkey is a file with the contents:

[ req ]
default_bits = 4096
distinguished_name = req_distinguished_name
prompt = no
string_mask = utf8only
x509_extensions = myexts

[ req_distinguished_name ]
CN = Modules

[ myexts ]
basicConstraints=critical,CA:FALSE
keyUsage=digitalSignature
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid

Refer to: https://wiki.gentoo.org/wiki/Signed_kernel_module_support

Option 2, is disable automated signing of modules in the config make menuconfig or make xconfig

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.