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I compiled simple drive for Linux kernel for ARM system:

$ uname -a

Linux CR5 4.4.171-cr5 #2 Tue Mar 10 11:49:00 CET 2020 armv7l GNU/Linux

To compile i used the config file from the up ruining system located at:

/proc/config.gz

i downloaded a vanilla kernel, checkout to tag 4.4.5, replace the config file ,compile the kernel, and then compile the drive with the tool-chine for arm

gcc-linaro-7.2.1-2017.11-i686_arm-linux-gnueabi The drive contain simple code

    #include <linux/module.h>
    #include <linux/kernel.h>

    int init_module(void) {
        printk(KERN_INFO "Hello world.\n");
        return 0;
    }

    void cleanup_module(void) {
        printk(KERN_INFO "Goodbye world.\n");
    }

i used insmod to load the driver but the err message to terminal is:

insmod: ERROR: could not insert module test_module.ko: Invalid module format

at the dmesg i get this message

test_module: disagrees about version of symbol module_layout

However, when i compere between running module in the system with my module with readelf -a

The ELF Header are the same and the File Attributes are the same.

what can i check more? Maybe the module loading was blocked by kernel? how can i check that? some one hes a lead for my what i can do next?

p.s

  • simple c program is ruining fine, so i guess the tool-chine is fine
  • insmod -f not work as well

Thanks

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problem was at the layout , even all the same same layout was changed

found answer here

here

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