tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 0513e464f9007b70b96740271a948ca5ab6e7dd7 commit: a28a6e860c6cf231cf3c5171c75c342adcd00406 string.h: move fortified functions definitions in a dedicated header. date: 7 months ago config: arm-randconfig-r001-20210928 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0 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/torvalds/linux.git/commit/?id=a28a6e860c6cf231cf3c5171c75c342adcd00406 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout a28a6e860c6cf231cf3c5171c75c342adcd00406 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): In file included from include/linux/string.h:269, from include/linux/bitmap.h:9, from include/linux/cpumask.h:12, from include/linux/smp.h:13, from include/linux/lockdep.h:14, from include/linux/spinlock.h:59, from include/linux/mmzone.h:8, from include/linux/gfp.h:6, from include/linux/umh.h:4, from include/linux/kmod.h:9, from include/linux/module.h:16, from lib/test_hexdump.c:8: In function 'strncpy', inlined from 'test_hexdump_prepare_test.constprop' at lib/test_hexdump.c:116:3: >> include/linux/fortify-string.h:27:33: warning: '__builtin_strncpy' output truncated copying between 0 and 32 bytes from a string of length 32 [-Wstringop-truncation] 27 | #define __underlying_strncpy __builtin_strncpy | ^ include/linux/fortify-string.h:38:16: note: in expansion of macro '__underlying_strncpy' 38 | return __underlying_strncpy(p, q, size); | ^~~~~~~~~~~~~~~~~~~~ vim +/__builtin_strncpy +27 include/linux/fortify-string.h 4 5 6 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) 7 extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr); 8 extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp); 9 extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy); 10 extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(memmove); 11 extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(memset); 12 extern char *__underlying_strcat(char *p, const char *q) __RENAME(strcat); 13 extern char *__underlying_strcpy(char *p, const char *q) __RENAME(strcpy); 14 extern __kernel_size_t __underlying_strlen(const char *p) __RENAME(strlen); 15 extern char *__underlying_strncat(char *p, const char *q, __kernel_size_t count) __RENAME(strncat); 16 extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size) __RENAME(strncpy); 17 #else 18 #define __underlying_memchr __builtin_memchr 19 #define __underlying_memcmp __builtin_memcmp 20 #define __underlying_memcpy __builtin_memcpy 21 #define __underlying_memmove __builtin_memmove 22 #define __underlying_memset __builtin_memset 23 #define __underlying_strcat __builtin_strcat 24 #define __underlying_strcpy __builtin_strcpy 25 #define __underlying_strlen __builtin_strlen 26 #define __underlying_strncat __builtin_strncat > 27 #define __underlying_strncpy __builtin_strncpy 28 #endif 29 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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