linux-kernel - warning: unsafe strcpy() usage lacked '__write_overflow' symbol in lib/test_fortify/write

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Message-ID: <202301150523.AIqAkqyf-lkp@intel.com>
Date:   Sun, 15 Jan 2023 05:20:32 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: warning: unsafe strcpy() usage lacked '__write_overflow' symbol in
 lib/test_fortify/write_overflow-strcpy-lit.c

Hi Kees,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7c698440524117dca7534592db0e7f465ae4d0bb
commit: 281d0c962752fb40866dd8d4cade68656f34bd1f fortify: Add Clang support
date:   11 months ago
config: mips-randconfig-r001-20230115
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 8d9828ef5aa9688500657d36cd2aefbe12bbd162)
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
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=281d0c962752fb40866dd8d4cade68656f34bd1f
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 281d0c962752fb40866dd8d4cade68656f34bd1f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

>> warning: unsafe strcpy() usage lacked '__write_overflow' symbol in lib/test_fortify/write_overflow-strcpy-lit.c
--
>> warning: unsafe strcpy() usage lacked '__write_overflow' symbol in lib/test_fortify/write_overflow-strcpy.c
--
>> warning: unsafe strlcpy() usage lacked '__write_overflow' symbol in lib/test_fortify/write_overflow-strlcpy-src.c
--
>> warning: unsafe strlcpy() usage lacked '__write_overflow' symbol in lib/test_fortify/write_overflow-strlcpy.c

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests

View attachment "config" of type "text/plain" (157495 bytes)