Hi Kees, kernel test robot noticed the following build warnings: [auto build test WARNING on kees/for-next/hardening] [also build test WARNING on kees/for-next/pstore kees/for-next/kspp linus/master tip/x86/core v6.3-rc5 next-20230406] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Kees-Cook/kunit-tool-Enable-CONFIG_FORTIFY_SOURCE-under-UML/20230408-032959 base: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/hardening patch link: https://lore.kernel.org/r/20230407192717.636137-7-keescook%40chromium.org patch subject: [PATCH v2 07/10] fortify: Split reporting and avoid passing string pointer config: arm-randconfig-r046-20230404 (https://download.01.org/0day-ci/archive/20230408/202304081026.0GjsJGNP-lkp@xxxxxxxxx/config) compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0 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://github.com/intel-lab-lkp/linux/commit/124d051177d6812a0b5bd445a9f89e0694d56f2d git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Kees-Cook/kunit-tool-Enable-CONFIG_FORTIFY_SOURCE-under-UML/20230408-032959 git checkout 124d051177d6812a0b5bd445a9f89e0694d56f2d # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202304081026.0GjsJGNP-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): arch/arm/boot/compressed/misc.c:129:17: warning: no previous prototype for '__div0' [-Wmissing-prototypes] 129 | asmlinkage void __div0(void) | ^~~~~~ arch/arm/boot/compressed/misc.c:138:1: warning: no previous prototype for 'decompress_kernel' [-Wmissing-prototypes] 138 | decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p, | ^~~~~~~~~~~~~~~~~ >> arch/arm/boot/compressed/misc.c:163:6: warning: no previous prototype for '__fortify_panic' [-Wmissing-prototypes] 163 | void __fortify_panic(const u8 reason) | ^~~~~~~~~~~~~~~ vim +/__fortify_panic +163 arch/arm/boot/compressed/misc.c 128 > 129 asmlinkage void __div0(void) 130 { 131 error("Attempting division by 0!"); 132 } 133 134 extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x)); 135 136 137 void 138 decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p, 139 unsigned long free_mem_ptr_end_p, 140 int arch_id) 141 { 142 int ret; 143 144 output_data = (unsigned char *)output_start; 145 free_mem_ptr = free_mem_ptr_p; 146 free_mem_end_ptr = free_mem_ptr_end_p; 147 __machine_arch_type = arch_id; 148 149 #ifdef CONFIG_ARCH_EP93XX 150 ep93xx_decomp_setup(); 151 #endif 152 arch_decomp_setup(); 153 154 putstr("Uncompressing Linux..."); 155 ret = do_decompress(input_data, input_data_end - input_data, 156 output_data, error); 157 if (ret) 158 error("decompressor returned an error"); 159 else 160 putstr(" done, booting the kernel.\n"); 161 } 162 > 163 void __fortify_panic(const u8 reason) -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
