How to get default kernel module name from *.ko files?

Question

Usually, the filename of a kernel module is the same as the module name. For example, after doing insmod fuse.ko , I can see fuse inserted in /proc/modules .

However, renaming the kernel module ( mv fuse.ko foo.ko ) doesn't affect the inserted module name. Doing insmod foo.ko still inserts fuse in /proc/modules .

Is there any system call or glibc function that can extract the module name from a kernel module file? In the previous example, I want to extract the name fuse from foo.ko .

Answer 1

Name of the module is contained in THIS_MODULE module object (of type struct module ). This object is stored in the kernel module file as a section .gnu.linkonce.this_module .

So, you may examine content of that section and find module's name there:

objdump -s -j .gnu.linkonce.this_module foo.ko

or

readelf -x .gnu.linkonce.this_module foo.ko

Module name is located at offset 12 (on 32-bit machine) or at offset 24 (on 64-bit machine).

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modinfo doesn't print module's name. Probably, this is because offset of the name in the struct module structure is not standardized.