[Buildroot] [Bug 14701] Multiple unresolved symbols while building kernel module package

[bugzilla@busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=14701

--- Comment #4 from José Pekkarinen <jose.pekkarinen@unikie.com> ---
I want to highlight that this may be a buildroot issue, and not
a driver, or a linux one. This is because I tried the same kernel
version on my laptop:

$ uname -r
5.15.21-hardened1

And this is the building output of the module:

 make
make -C /lib/modules/5.15.21-hardened1/build
M=/home/pekkari/linux-sgx-driver-sgx_driver_2.14 modules
make[1]: Entering directory '/usr/src/linux-headers-5.15.21-hardened1'
  CC [M]  /home/pekkari/linux-sgx-driver-sgx_driver_2.14/sgx_main.o
  CC [M]  /home/pekkari/linux-sgx-driver-sgx_driver_2.14/sgx_page_cache.o
  CC [M]  /home/pekkari/linux-sgx-driver-sgx_driver_2.14/sgx_ioctl.o
  CC [M]  /home/pekkari/linux-sgx-driver-sgx_driver_2.14/sgx_vma.o
  CC [M]  /home/pekkari/linux-sgx-driver-sgx_driver_2.14/sgx_util.o
  CC [M]  /home/pekkari/linux-sgx-driver-sgx_driver_2.14/sgx_encl.o
  CC [M]  /home/pekkari/linux-sgx-driver-sgx_driver_2.14/sgx_encl2.o
  LD [M]  /home/pekkari/linux-sgx-driver-sgx_driver_2.14/isgx.o
  MODPOST /home/pekkari/linux-sgx-driver-sgx_driver_2.14/Module.symvers
WARNING: modpost: modpost: Found 2 writable function pointers.
To see full details build your kernel with:
'make CONFIG_DEBUG_WRITABLE_FUNCTION_POINTERS_VERBOSE=y'
  CC [M]  /home/pekkari/linux-sgx-driver-sgx_driver_2.14/isgx.mod.o
  LD [M]  /home/pekkari/linux-sgx-driver-sgx_driver_2.14/isgx.ko
make[1]: Leaving directory '/usr/src/linux-headers-5.15.21-hardened1'

and installing and loading the module I can see in dmesg:

[  233.145965] isgx: loading out-of-tree module taints kernel.
[  233.146006] isgx: module verification failed: signature and/or required key
missing - tainting kernel
[  233.146559] intel_sgx: the CPU is missing SGX

So symbols are in place, kernel is not wrong, module either, but
buildroot configures the linker in a way the symbols are not found.

Thanks!

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