Hi Bhupesh, kernel test robot noticed the following build warnings: [auto build test WARNING on trace/for-next] [also build test WARNING on tip/sched/core akpm-mm/mm-everything linus/master v6.15-rc7 next-20250521] [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/Bhupesh/exec-Remove-obsolete-comments/20250521-142443 base: https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace for-next patch link: https://lore.kernel.org/r/20250521062337.53262-3-bhupesh%40igalia.com patch subject: [PATCH v4 2/3] treewide: Switch memcpy() users of 'task->comm' to a more safer implementation config: arc-randconfig-002-20250522 (https://download.01.org/0day-ci/archive/20250522/202505220326.5yDQHjnt-lkp@xxxxxxxxx/config) compiler: arc-linux-gcc (GCC) 8.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250522/202505220326.5yDQHjnt-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202505220326.5yDQHjnt-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from fs/coredump.c:20: fs/coredump.c: In function 'do_coredump': >> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds] comm[TASK_COMM_LEN] = '\0'; \ ~~~~^~~~~~~~~~~~~~~ include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK' #define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__) ^~~~~~~~~~~~~~~~~ fs/coredump.c:655:4: note: in expansion of macro 'coredump_report_failure' coredump_report_failure( ^~~~~~~~~~~~~~~~~~~~~~~ >> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds] comm[TASK_COMM_LEN] = '\0'; \ ~~~~^~~~~~~~~~~~~~~ include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK' #define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__) ^~~~~~~~~~~~~~~~~ fs/coredump.c:730:4: note: in expansion of macro 'coredump_report_failure' coredump_report_failure("Core dump to %s aborted: " ^~~~~~~~~~~~~~~~~~~~~~~ >> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds] comm[TASK_COMM_LEN] = '\0'; \ ~~~~^~~~~~~~~~~~~~~ include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK' #define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__) ^~~~~~~~~~~~~~~~~ fs/coredump.c:725:4: note: in expansion of macro 'coredump_report_failure' coredump_report_failure("Core dump to %s aborted: " ^~~~~~~~~~~~~~~~~~~~~~~ >> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds] comm[TASK_COMM_LEN] = '\0'; \ ~~~~^~~~~~~~~~~~~~~ include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK' #define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__) ^~~~~~~~~~~~~~~~~ fs/coredump.c:618:4: note: in expansion of macro 'coredump_report_failure' coredump_report_failure("over core_pipe_limit, skipping core dump"); ^~~~~~~~~~~~~~~~~~~~~~~ >> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds] comm[TASK_COMM_LEN] = '\0'; \ ~~~~^~~~~~~~~~~~~~~ include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK' #define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__) ^~~~~~~~~~~~~~~~~ fs/coredump.c:642:4: note: in expansion of macro 'coredump_report_failure' coredump_report_failure("|%s pipe failed", cn.corename); ^~~~~~~~~~~~~~~~~~~~~~~ >> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds] comm[TASK_COMM_LEN] = '\0'; \ ~~~~^~~~~~~~~~~~~~~ include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK' #define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__) ^~~~~~~~~~~~~~~~~ fs/coredump.c:625:4: note: in expansion of macro 'coredump_report_failure' coredump_report_failure("%s failed to allocate memory", __func__); ^~~~~~~~~~~~~~~~~~~~~~~ >> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds] comm[TASK_COMM_LEN] = '\0'; \ ~~~~^~~~~~~~~~~~~~~ include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK' #define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__) ^~~~~~~~~~~~~~~~~ fs/coredump.c:611:4: note: in expansion of macro 'coredump_report_failure' coredump_report_failure("RLIMIT_CORE is set to 1, aborting core"); ^~~~~~~~~~~~~~~~~~~~~~~ >> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds] comm[TASK_COMM_LEN] = '\0'; \ ~~~~^~~~~~~~~~~~~~~ include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK' #define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__) ^~~~~~~~~~~~~~~~~ fs/coredump.c:591:4: note: in expansion of macro 'coredump_report_failure' coredump_report_failure("format_corename failed, aborting core"); ^~~~~~~~~~~~~~~~~~~~~~~ >> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds] comm[TASK_COMM_LEN] = '\0'; \ ~~~~^~~~~~~~~~~~~~~ include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK' #define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__) ^~~~~~~~~~~~~~~~~ fs/coredump.c:752:4: note: in expansion of macro 'coredump_report_failure' coredump_report_failure("Core dump to |%s disabled", cn.corename); ^~~~~~~~~~~~~~~~~~~~~~~ fs/coredump.c: In function 'validate_coredump_safety': >> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds] comm[TASK_COMM_LEN] = '\0'; \ ~~~~^~~~~~~~~~~~~~~ include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK' #define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__) ^~~~~~~~~~~~~~~~~ fs/coredump.c:1006:3: note: in expansion of macro 'coredump_report_failure' coredump_report_failure("Unsafe core_pattern used with fs.suid_dumpable=2: " ^~~~~~~~~~~~~~~~~~~~~~~ vim +57 include/linux/coredump.h 46 47 /* 48 * Logging for the coredump code, ratelimited. 49 * The TGID and comm fields are added to the message. 50 */ 51 52 #define __COREDUMP_PRINTK(Level, Format, ...) \ 53 do { \ 54 char comm[TASK_COMM_LEN]; \ 55 /* This will always be NUL terminated. */ \ 56 memcpy(comm, current->comm, TASK_COMM_LEN); \ > 57 comm[TASK_COMM_LEN] = '\0'; \ 58 printk_ratelimited(Level "coredump: %d(%*pE): " Format "\n", \ 59 task_tgid_vnr(current), (int)strlen(comm), comm, ##__VA_ARGS__); \ 60 } while (0) \ 61 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
