[kbuild-all] block/partitions/ldm.c:134:9: warning: 'strncpy' specified bound 16 equals destination size

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: ec681c53f8d2d0ee362ff67f5b98dd8263c15002 commit: 334ef6ed06fa1a54e35296b77b693bcf6d63ee9e init/Kconfig: make COMPILE_TEST depend on !S390 date: 11 months ago config: s390-randconfig-r044-20211015 (attached as .config) compiler: s390-linux-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... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 334ef6ed06fa1a54e35296b77b693bcf6d63ee9e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=s390 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 'ldm_parse_tocblock', inlined from 'ldm_validate_tocblocks' at block/partitions/ldm.c:386:7: 134 | strncpy (toc->bitmap1_name, data + 0x24, sizeof (toc->bitmap1_name)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ block/partitions/ldm.c:145:9: warning: 'strncpy' specified bound 16 equals destination size [-Wstringop-truncation] 145 | strncpy (toc->bitmap2_name, data + 0x46, sizeof (toc->bitmap2_name)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- kernel/trace/blktrace.c: In function '__trace_note_message': kernel/trace/blktrace.c:148:63: warning: parameter 'blkcg' set but not used [-Wunused-but-set-parameter] 148 | void __trace_note_message(struct blk_trace *bt, struct blkcg *blkcg, | ~~~~~~~~~~~~~~^~~~~ kernel/trace/blktrace.c: In function 'do_blk_trace_setup': 491 | strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/strncpy +134 block/partitions/ldm.c ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 111 ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 112 /** ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 113 * ldm_parse_tocblock - Read the LDM Database TOCBLOCK structure ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 114 * @data: Raw database TOCBLOCK structure loaded from the device ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 115 * @toc: In-memory toc structure in which to return parsed information ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 116 * ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 117 * This parses the LDM Database TOCBLOCK (table of contents) structure supplied ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 118 * in @data and sets up the in-memory tocblock structure @toc with the obtained ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 119 * information. ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 120 * ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 121 * N.B. The *_start and *_size values returned in @toc are not range-checked. ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 122 * 130c6b98984a05 fs/partitions/ldm.c Richard Knutsson 2006-09-30 123 * Return: 'true' @toc contains the TOCBLOCK data 130c6b98984a05 fs/partitions/ldm.c Richard Knutsson 2006-09-30 124 * 'false' @toc contents are undefined ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 125 */ 130c6b98984a05 fs/partitions/ldm.c Richard Knutsson 2006-09-30 126 static bool ldm_parse_tocblock (const u8 *data, struct tocblock *toc) ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 127 { ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 128 BUG_ON (!data || !toc); ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 129 b7bbf8fa6ba329 fs/partitions/ldm.c Harvey Harrison 2008-07-25 130 if (MAGIC_TOCBLOCK != get_unaligned_be64(data)) { ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 131 ldm_crit ("Cannot find TOCBLOCK, database may be corrupt."); 130c6b98984a05 fs/partitions/ldm.c Richard Knutsson 2006-09-30 132 return false; ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 133 } ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 @134 strncpy (toc->bitmap1_name, data + 0x24, sizeof (toc->bitmap1_name)); ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 135 toc->bitmap1_name[sizeof (toc->bitmap1_name) - 1] = 0; b7bbf8fa6ba329 fs/partitions/ldm.c Harvey Harrison 2008-07-25 136 toc->bitmap1_start = get_unaligned_be64(data + 0x2E); b7bbf8fa6ba329 fs/partitions/ldm.c Harvey Harrison 2008-07-25 137 toc->bitmap1_size = get_unaligned_be64(data + 0x36); ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 138 ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 139 if (strncmp (toc->bitmap1_name, TOC_BITMAP1, ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 140 sizeof (toc->bitmap1_name)) != 0) { ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 141 ldm_crit ("TOCBLOCK's first bitmap is '%s', should be '%s'.", ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 142 TOC_BITMAP1, toc->bitmap1_name); 130c6b98984a05 fs/partitions/ldm.c Richard Knutsson 2006-09-30 143 return false; ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 144 } ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 145 strncpy (toc->bitmap2_name, data + 0x46, sizeof (toc->bitmap2_name)); ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 146 toc->bitmap2_name[sizeof (toc->bitmap2_name) - 1] = 0; b7bbf8fa6ba329 fs/partitions/ldm.c Harvey Harrison 2008-07-25 147 toc->bitmap2_start = get_unaligned_be64(data + 0x50); b7bbf8fa6ba329 fs/partitions/ldm.c Harvey Harrison 2008-07-25 148 toc->bitmap2_size = get_unaligned_be64(data + 0x58); ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 149 if (strncmp (toc->bitmap2_name, TOC_BITMAP2, ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 150 sizeof (toc->bitmap2_name)) != 0) { ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 151 ldm_crit ("TOCBLOCK's second bitmap is '%s', should be '%s'.", ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 152 TOC_BITMAP2, toc->bitmap2_name); 130c6b98984a05 fs/partitions/ldm.c Richard Knutsson 2006-09-30 153 return false; ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 154 } ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 155 ldm_debug ("Parsed TOCBLOCK successfully."); 130c6b98984a05 fs/partitions/ldm.c Richard Knutsson 2006-09-30 156 return true; ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 157 } ^1da177e4c3f41 fs/partitions/ldm.c Linus Torvalds 2005-04-16 158 :::::: The code at line 134 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