tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 840126e36e8ff272cb63158646433fa1324533d9 commit: 14fa26474621071a2f62696261562fdb40c07f5c [4364/5667] string: Introduce strtomem() and strtomem_pad() config: openrisc-randconfig-r024-20220906 (https://download.01.org/0day-ci/archive/20220907/202209070728.o3stvgVt-lkp@xxxxxxxxx/config) compiler: or1k-linux-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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=14fa26474621071a2f62696261562fdb40c07f5c git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 14fa26474621071a2f62696261562fdb40c07f5c # 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=openrisc SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): In file included from include/linux/kernel.h:26, from include/linux/cpumask.h:10, from include/linux/smp.h:13, from include/linux/lockdep.h:14, from include/linux/spinlock.h:62, from include/linux/kref.h:16, from include/kunit/test.h:20, from lib/memcpy_kunit.c:7: lib/memcpy_kunit.c: In function 'strtomem_test': >> include/linux/string.h:303:42: warning: 'strnlen' specified bound 4 exceeds source size 3 [-Wstringop-overread] 303 | memcpy(dest, src, min(_dest_len, strnlen(src, _dest_len))); \ include/linux/minmax.h:32:39: note: in definition of macro '__cmp_once' 32 | typeof(y) unique_y = (y); \ | ^ include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp' 45 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ include/linux/string.h:303:27: note: in expansion of macro 'min' 303 | memcpy(dest, src, min(_dest_len, strnlen(src, _dest_len))); \ | ^~~ lib/memcpy_kunit.c:290:9: note: in expansion of macro 'strtomem' 290 | strtomem(wrap.output, input); | ^~~~~~~~ lib/memcpy_kunit.c:275:27: note: source object allocated here 275 | static const char input[] = "hi"; | ^~~~~ In file included from include/linux/bitmap.h:11, from include/linux/cpumask.h:12: include/linux/string.h:282:9: warning: 'strnlen' specified bound 4 exceeds source size 3 [-Wstringop-overread] 282 | memcpy_and_pad(dest, _dest_len, src, strnlen(src, _dest_len), pad); \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ lib/memcpy_kunit.c:308:9: note: in expansion of macro 'strtomem_pad' 308 | strtomem_pad(wrap.output, input, 0xAA); | ^~~~~~~~~~~~ lib/memcpy_kunit.c:275:27: note: source object allocated here 275 | static const char input[] = "hi"; | ^~~~~ vim +/strnlen +303 include/linux/string.h 284 285 /** 286 * strtomem - Copy NUL-terminated string to non-NUL-terminated buffer 287 * 288 * @dest: Pointer of destination character array (marked as __nonstring) 289 * @src: Pointer to NUL-terminated string 290 * 291 * This is a replacement for strncpy() uses where the destination is not 292 * a NUL-terminated string, but with bounds checking on the source size, and 293 * without trailing padding. If padding is required, use strtomem_pad(). 294 * 295 * Note that the size of @dest is not an argument, as the length of @dest 296 * must be discoverable by the compiler. 297 */ 298 #define strtomem(dest, src) do { \ 299 const size_t _dest_len = __builtin_object_size(dest, 1); \ 300 \ 301 BUILD_BUG_ON(!__builtin_constant_p(_dest_len) || \ 302 _dest_len == (size_t)-1); \ > 303 memcpy(dest, src, min(_dest_len, strnlen(src, _dest_len))); \ 304 } while (0) 305 -- 0-DAY CI Kernel Test Service https://01.org/lkp
