Re: [PATCH v3 8/9] objtool/klp: Fix relocations for EXPORT_SYMBOL_FOR_MODULES() symbols

On Fri, Aug 14, 2026 at 02:05:48PM -0700, Dylan Hatch wrote:
> Following up on the other thread [1], I noticed that when a patch is
> touching a module function with a reference to one of these
> module-exported symbols, the patch/module is rejected because KLP
> relocs referencing vmlinux symbols are not allowed from
> module-specific livepatch relocation sections. I was able to reproduce
> this with a simple module/livepatch combo that depends on one of these
> symbols [2] (see samples/livepatch/testmod.c and test.patch):
> 
> root@debian-vm:~$ insmod livepatch-test.ko
> root@debian-vm:~$ insmod testmod.ko
> insmod: ERROR: could not insert module testmod.ko: Invalid parameters
> 
> With dmesg:
> [  655.596876] livepatch_test: loading out-of-tree module taints kernel.
> [  655.600961] livepatch_test: tainting kernel with TAINT_LIVEPATCH
> [  655.605436] livepatch: enabling patch 'livepatch_test'
> [  655.609119] livepatch: 'livepatch_test': starting patching transition
> [  656.653454] livepatch: 'livepatch_test': patching complete
> [  738.777872] livepatch: invalid access to vmlinux symbol
> 'get_task_policy' from module-specific livepatch relocation section
> [  738.784899] livepatch: failed to initialize patch 'livepatch_test'
> for module 'testmod' (-22)
> [  738.790371] livepatch: patch 'livepatch_test' failed for module
> 'testmod', refusing to load module 'testmod'
> 
> Do you recommend a strategy for working around this, or is this
> something that would have to be fixed in the kernel?

Ah, this is another tooling issue, let me work up a patch.

-- 
Josh