linux-kernel - [kees:memcpy/step2/next-20211206 19/19] ld.lld: warning: call to __read_overflow2_field marked "dontcall-warn": detected read beyond size of field (2nd parameter); maybe use struct

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Message-ID: <202112080941.omOoH0rV-lkp@intel.com>
Date:   Wed, 8 Dec 2021 10:03:03 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [kees:memcpy/step2/next-20211206 19/19] ld.lld: warning: call to
 __read_overflow2_field marked "dontcall-warn": detected read beyond size of
 field (2nd parameter); maybe use struct_group()?

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git memcpy/step2/next-20211206
head:   082faead4a3c2e5d9f541f97d8d4d5fa0f88dce0
commit: 082faead4a3c2e5d9f541f97d8d4d5fa0f88dce0 [19/19] fortify: Work around Clang inlining bugs
config: i386-randconfig-a012-20211207 (https://download.01.org/0day-ci/archive/20211208/202112080941.omOoH0rV-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 097a1cb1d5ebb3a0ec4bcaed8ba3ff6a8e33c00a)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?id=082faead4a3c2e5d9f541f97d8d4d5fa0f88dce0
        git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git
        git fetch --no-tags kees memcpy/step2/next-20211206
        git checkout 082faead4a3c2e5d9f541f97d8d4d5fa0f88dce0
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> ld.lld: warning: call to __read_overflow2_field marked "dontcall-warn": detected read beyond size of field (2nd parameter); maybe use struct_group()?
>> ld.lld: warning: call to __read_overflow2_field marked "dontcall-warn": detected read beyond size of field (2nd parameter); maybe use struct_group()?

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org