linux-kernel - Re: WARNING: modpost: vmlinux: section mismatch in reference: __apply_fineibt+0x566 (section: .text) -> poison

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Date: Mon, 15 Apr 2024 10:14:03 -0700
From: Kees Cook <keescook@...omium.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
	oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Sami Tolvanen <samitolvanen@...gle.com>
Subject: Re: WARNING: modpost: vmlinux: section mismatch in reference:
 __apply_fineibt+0x566 (section: .text) -> poison_endbr (section: .init.text)

On Mon, Apr 15, 2024 at 10:15:48AM +0800, kernel test robot wrote:
> Hi Peter,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   0bbac3facb5d6cc0171c45c9873a2dc96bea9680
> commit: 04505bbbbb15da950ea0239e328a76a3ad2376e0 x86/fineibt: Poison ENDBR at +0
> date:   9 months ago
> config: x86_64-buildonly-randconfig-001-20240415 (https://download.01.org/0day-ci/archive/20240415/202404151042.vATlNGmU-lkp@intel.com/config)
> compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240415/202404151042.vATlNGmU-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202404151042.vATlNGmU-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>, old ones prefixed by <<):
> 
> WARNING: modpost: missing MODULE_DESCRIPTION() in vmlinux.o
> WARNING: modpost: vmlinux: section mismatch in reference: __apply_fineibt+0x12e (section: .text) -> text_poke_early (section: .init.text)
> WARNING: modpost: vmlinux: section mismatch in reference: __apply_fineibt+0x1f2 (section: .text) -> text_poke_early (section: .init.text)
> WARNING: modpost: vmlinux: section mismatch in reference: __apply_fineibt+0x2e6 (section: .text) -> text_poke_early (section: .init.text)
> WARNING: modpost: vmlinux: section mismatch in reference: __apply_fineibt+0x381 (section: .text) -> text_poke_early (section: .init.text)
> WARNING: modpost: vmlinux: section mismatch in reference: __apply_fineibt+0x3a4 (section: .text) -> text_poke_early (section: .init.text)
> WARNING: modpost: vmlinux: section mismatch in reference: __apply_fineibt+0x44d (section: .text) -> text_poke_early (section: .init.text)
> WARNING: modpost: vmlinux: section mismatch in reference: __apply_fineibt+0x50d (section: .text) -> text_poke_early (section: .init.text)
> WARNING: modpost: vmlinux: section mismatch in reference: __apply_fineibt+0x532 (section: .text) -> text_poke_early (section: .init.text)
> >> WARNING: modpost: vmlinux: section mismatch in reference: __apply_fineibt+0x566 (section: .text) -> poison_endbr (section: .init.text)

test_poke_early() already marked __init_or_module, so shouldn't these
warnings not happen? (I assume the same is for true poison_endbr)

-- 
Kees Cook