I’m using Ubuntu 14.04 LTS and kernel version 3.13.11.4. I’m trying to load patched KVM modules kvm and kvm-intel and I’m getting the following errors kvm: module verification failed: signature and/or required key missing – tainting kernel and kvm: module has bad taint, not creating tr…
Tag: kernel-module
Kernel Modul and SSL
at the moment I am working on the kernel module of ccn-lite (http://www.ccn-lite.net/). For that I need some security functionality (sha1 and public/private key authentificaton). For the user-space I use the openssl library, but I cannot use a library in the kernel module. It is also hard to pick the function…
How to debug the init_module() call of a Linux kernel module?
I am doing first steps into Linux kernel development. I have some code producing a .ko kernel module that I install with insmod. I would like a way to debug what happens when I install the module but I am facing some difficulties. I need to debug the call to init_module. Is this function called when I run ins…
Periodic task in a Linux kernel module
Currently I am developing GPIO kernel module for friendlyarm Linux 2.6.32.2 (mini2440). I am from electronics background and new to Linux. The kernel module loaded at start-up and the related device file is located in /dev as gpiofreq. At first time writing to device file, GPIO pin toggles continuously at 50k…
Unknown symbol in while loading a kernel module
I need help understanding why I get an error when I insert a module. I have tried this with no success. Many thanks. Answer I have solved this problem as suggested on this forum: Compiled scst. Appended the generated Module.symvers to existent /lib/modules/<version>/build/Module.symvers (Hack. Do not kn…
Linux kernel module compiling
I try to compile simple linux kernel module: My makefile: Now i haven’t errors in my .c file. But when i try make in terminal: make: Nothing to be done for `all’. What’s wrong? Thank you. Answer The default command in your makefile is That instructs make to cd to /lib/modules/$(KVERSION)/bui…
How to debug problems in Linux kernel module `init()`?
I am using remote (k)gdb to debug a problem in a module that causes a panic when loaded e.g. when init() is called. The stack trace just shows that do_one_initcall(mod->init) causes the crash. In order to get the symbol file loaded in the gdb, I need to get the address of the module text section, and to ge…