New: Multiple unresolved symbols while building kernel module package

Buildroot [email protected] 1 participant 6 messages Mar 28, 2022 – Apr 7, 2022

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author

2022-03-28 06:11 UTC #0 lore raw

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

            Bug ID: 14701
           Summary: Multiple unresolved symbols while building kernel
                    module package
           Product: buildroot
           Version: 2021.11.1
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]

Target Milestone: ---

Hi,

I'm trying to build a package for sgx driver:

https://github.com/intel/linux-sgx

The package looks like:

sgx-driver.mk:

################################################################################
#

# sgx-driver
#
################################################################################

SGX_DRIVER_VERSION = 2.14
SGX_DRIVER_SOURCE = sgx_driver_$(SGX_DRIVER_VERSION).tar.gz SGX_DRIVER_SITE = https://github.com/intel/linux-sgx-driver/archive/refs/tags
SGX_DRIVER_LICENSE = BSD-3-Clause, GPL-2.0 SGX_DRIVER_LICENSE_FILES = License.txt

$(eval $(kernel-module))
$(eval $(generic-package))

Config.in:

comment "sgx-driver needs a Linux kernel to be built"
depends on !BR2_LINUX_KERNEL

config BR2_PACKAGE_SGX_DRIVER
bool "sgx-driver"
depends on BR2_LINUX_KERNEL
help
Intel sgx driver for secured containers.

https://github.com/intel/linux-sgx-driver

When building with a valid config, the build process stops like this:

Quoted 1 line

Quoted 1 line
Quoted 1 line
sgx-driver 2.14 Building kernel module(s)

PATH="/usr/src/output/br_admin/output_x86_upxtreme/host/bin:/usr/src/output/br_admin/output_x86_upxtreme/host/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" PKG_CONFIG="/usr/src/output/br_admin/output_x86_upxtreme/host/bin/pkg-config"
PKG_CONFIG_SYSROOT_DIR="/" PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1
PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 PKG_CONFIG_LIBDIR="/usr/src/output/br_admin/output_x86_upxtreme/host/lib/pkgconfig:/usr/src/output/br_admin/output_x86_upxtreme/host/share/pkgconfig" BR_BINARIES_DIR=/usr/src/output/br_admin/output_x86_upxtreme/images
KCFLAGS=-Wno-attribute-alias /usr/bin/make -j9 -C
/usr/src/output/br_admin/output_x86_upxtreme/build/linux-tc-x86-5.15-sec
HOSTCC="/usr/src/output/br_admin/output_x86_upxtreme/host/bin/ccache
/usr/bin/gcc -O2 -I/usr/src/output/br_admin/output_x86_upxtreme/host/include
-L/usr/src/output/br_admin/output_x86_upxtreme/host/lib
-Wl,-rpath,/usr/src/output/br_admin/output_x86_upxtreme/host/lib" ARCH=x86_64
INSTALL_MOD_PATH=/usr/src/output/br_admin/output_x86_upxtreme/target CROSS_COMPILE="/usr/src/output/br_admin/output_x86_upxtreme/host/bin/x86_64-TII-linux-gnu-" DEPMOD=/usr/src/output/br_admin/output_x86_upxtreme/host/sbin/depmod
INSTALL_MOD_STRIP=1
PWD=/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/.
M=/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/. modules
make[2]: Entering directory
'/usr/src/output/br_admin/output_x86_upxtreme/build/linux-tc-x86-5.15-sec'
CC [M]
/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./sgx_main.o
CC [M]
/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./sgx_page_cache.o
CC [M]
/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./sgx_ioctl.o
CC [M]
/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./sgx_vma.o
CC [M]
/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./sgx_util.o
CC [M]
/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./sgx_encl.o
CC [M]
/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./sgx_encl2.o
LD [M]
/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./isgx.o
MODPOST
/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./Module.symvers
ERROR: modpost: "flush_work"
[/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./isgx.ko]
undefined!
ERROR: modpost: "put_pid"
[/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./isgx.ko]
undefined!
ERROR: modpost: "up_read"
[/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./isgx.ko]
undefined!
ERROR: modpost: "boot_cpu_data"
[/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./isgx.ko]
undefined!
ERROR: modpost: "system_freezing_cnt"
[/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./isgx.ko]
undefined!
ERROR: modpost: "mmu_notifier_register"
[/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./isgx.ko]
undefined!
ERROR: modpost: "__warn_printk"
[/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./isgx.ko]
undefined!
ERROR: modpost: "__x86_indirect_alt_call_rbx"
[/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./isgx.ko]
undefined!
ERROR: modpost: "__x86_indirect_thunk_rcx"
[/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./isgx.ko]
undefined!
ERROR: modpost: "alloc_pages"
[/usr/src/output/br_admin/output_x86_upxtreme/build/sgx-driver-2.14/./isgx.ko]
undefined!
WARNING: modpost: suppressed 65 unresolved symbol warnings because there were
too many)
WARNING: modpost: modpost: Found 2 writable function pointers.

While the symbols can be found in the original
source code of the kernel. Am I missing something
in the package to resolv the symbols?

Thanks!

José.

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author

2022-03-29 06:08 UTC #1 lore raw

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

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

--- Comment #1 from José Pekkarinen <[email protected]> --- Is there any way I can set in buildroot KBUILD_MODPOST_WARN? According to the kernel documentation it will set all errors as warning, and this is for testing purposes only, so no matter if it boils out.

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author

2022-03-29 06:21 UTC #2 lore raw

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

In reply to [email protected]

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

--- Comment #2 from José Pekkarinen <[email protected]> --- as a workaround I have added to the package the following line:

SGX_DRIVER_MAKE_OPTS=KBUILD_MODPOST_WARN=1

That allows to build and test stuff. I'm uncertain this is a kernel bug instead of a buildroot one by now.

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author

2022-03-29 07:23 UTC #3 lore raw

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

In reply to [email protected]

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

--- Comment #3 from José Pekkarinen <[email protected]> --- This is the list of "missing" symbols:

depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __put_page
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __check_object_size
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol vmf_insert_pfn
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol misc_deregister
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol alloc_workqueue
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol radix_tree_insert
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __x86_indirect_alt_call_rcx
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol platform_driver_unregister
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol on_each_cpu_cond_mask
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol queue_work_on
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol stackleak_track_stack
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol _find_first_bit
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol radix_tree_lookup
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __x86_indirect_alt_call_rax
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol finish_wait
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol ioremap_cache
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol iounmap
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol _find_first_zero_bit
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol set_freezable
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol zap_vma_ptes
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol ex_handler_default
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol prepare_to_wait_event
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol kthread_should_stop
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __wake_up
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol _raw_spin_lock
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol msleep_interruptible
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol wake_up_process
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __refrigerator
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __x86_indirect_thunk_rax
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol _printk
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol schedule
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol refcount_warn_saturate
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol smp_call_function
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __free_pages
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol _dev_info
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol find_vma
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol page_offset_base
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __cond_resched
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol radix_tree_delete
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol init_wait_entry
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol shmem_file_setup
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __list_add_valid
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol fput
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol radix_tree_next_chunk
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol platform_device_unregister
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol destroy_workqueue
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __x86_indirect_thunk_rbx
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol shmem_read_mapping_page_gfp
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol apply_to_page_range
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol mmu_notifier_unregister
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __cpu_online_mask
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __list_del_entry_valid
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol kthread_stop
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __mutex_init
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol freezing_slow_path
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol current_task
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol misc_register
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol _copy_to_user
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol down_read
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __platform_driver_register
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol kthread_create_on_node
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol set_page_dirty
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol vmemmap_base
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __ubsan_handle_shift_out_of_bounds
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol platform_device_register_full
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol alloc_pages
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __x86_indirect_thunk_rcx
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __x86_indirect_alt_call_rbx
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol __warn_printk
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol mmu_notifier_register
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol system_freezing_cnt
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol boot_cpu_data
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol up_read
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol put_pid
depmod: WARNING:
/usr/src/output/br_admin/output_x86_upxtreme/target/lib/modules/5.15.21-hardened1/extra/isgx.ko needs unknown symbol flush_work

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author

2022-03-30 05:37 UTC #4 lore raw

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

In reply to [email protected]

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

--- Comment #4 from José Pekkarinen <[email protected]> --- 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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author

2022-04-07 05:18 UTC #5 lore raw

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

In reply to [email protected]

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

José Pekkarinen <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED

--- Comment #5 from José Pekkarinen <[email protected]> --- Kernel was trimminig unused symbols, removing the config to trim them makes the module build properly. Sorry!

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