[kbuild-all] [gustavoars-linux:for-next/Warray-bounds 1/1] arch/arm/kernel/atags_compat.c:200:2: warning: 'strcpy' offset 364 from the object at 'tags' is out of the bounds of referenced subobject 'cmdline' with type 'char[1]' at offset 364

tree: https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git for-next/Warray-bounds head: 0d6455c92b82b36e29e5206a46329058d75fbc33 commit: 0d6455c92b82b36e29e5206a46329058d75fbc33 [1/1] Makefile: Enable -Warray-bounds config: arm-randconfig-r035-20210715 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 10.3.0 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://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/comm... git remote add gustavoars-linux https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git git fetch --no-tags gustavoars-linux for-next/Warray-bounds git checkout 0d6455c92b82b36e29e5206a46329058d75fbc33 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In function 'build_tag_list', inlined from 'convert_to_tag_list' at arch/arm/kernel/atags_compat.c:213:2: 200 | strcpy(tag->u.cmdline.cmdline, params->commandline); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from arch/arm/include/asm/setup.h:14, from arch/arm/kernel/atags_compat.c:20: arch/arm/kernel/atags_compat.c: In function 'convert_to_tag_list': arch/arm/include/uapi/asm/setup.h:127:7: note: subobject 'cmdline' declared here 127 | char cmdline[1]; /* this is the minimum size */ | ^~~~~~~ vim +200 arch/arm/kernel/atags_compat.c ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 195 ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 196 tag = tag_next(tag); ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 197 tag->hdr.tag = ATAG_CMDLINE; ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 198 tag->hdr.size = (strlen(params->commandline) + 3 + ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 199 sizeof(struct tag_header)) >> 2; ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 @200 strcpy(tag->u.cmdline.cmdline, params->commandline); ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 201 ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 202 tag = tag_next(tag); ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 203 tag->hdr.tag = ATAG_NONE; ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 204 tag->hdr.size = 0; ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 205 ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 206 memmove(params, taglist, ((int)tag) - ((int)taglist) + ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 207 sizeof(struct tag_header)); ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 208 } ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 209 ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 210 void __init convert_to_tag_list(struct tag *tags) ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 211 { ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 212 struct param_struct *params = (struct param_struct *)tags; ^1da177e4c3f41 arch/arm/kernel/compat.c Linus Torvalds 2005-04-16 @213 build_tag_list(params, &params->u2); :::::: The code at line 200 was first introduced by commit :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 :::::: TO: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; :::::: CC: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org