tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git pending-5.4 head: 2f06062940cf83ed6c2aeeb9e0c5138f08b486a9 commit: 3f22c9fce5f5817075f812f37fcffbefce477a69 [46/75] tracing: Add length protection to histogram string copies config: x86_64-randconfig-a001-20211122 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c133fb321f7ca6083ce15b6aa5bf89de6600e649) 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/sashal/linux-stable.git/c... git remote add sashal-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-stable pending-5.4 git checkout 3f22c9fce5f5817075f812f37fcffbefce477a69 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 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 >>): size = min(val->size, STR_VAR_LEN_MAX); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/kernel.h:875:19: note: expanded from macro 'min' #define min(x, y) __careful_cmp(x, y, <) ^~~~~~~~~~~~~~~~~~~~~~ include/linux/kernel.h:866:24: note: expanded from macro '__careful_cmp' __builtin_choose_expr(__safe_cmp(x, y), \ ^~~~~~~~~~~~~~~~ include/linux/kernel.h:856:4: note: expanded from macro '__safe_cmp' (__typecheck(x, y) && __no_side_effects(x, y)) ^~~~~~~~~~~~~~~~~ include/linux/kernel.h:842:29: note: expanded from macro '__typecheck' (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1))) ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~ size = min(hist_field->size, STR_VAR_LEN_MAX); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/kernel.h:875:19: note: expanded from macro 'min' #define min(x, y) __careful_cmp(x, y, <) ^~~~~~~~~~~~~~~~~~~~~~ include/linux/kernel.h:866:24: note: expanded from macro '__careful_cmp' __builtin_choose_expr(__safe_cmp(x, y), \ ^~~~~~~~~~~~~~~~ include/linux/kernel.h:856:4: note: expanded from macro '__safe_cmp' (__typecheck(x, y) && __no_side_effects(x, y)) ^~~~~~~~~~~~~~~~~ include/linux/kernel.h:842:29: note: expanded from macro '__typecheck' (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1))) ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~ kernel/trace/trace_events_hist.c:5861:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable] int ret; ^ 3 warnings generated. vim +3535 kernel/trace/trace_events_hist.c 3510 3511 static inline void __update_field_vars(struct tracing_map_elt *elt, 3512 struct ring_buffer_event *rbe, 3513 void *rec, 3514 struct field_var **field_vars, 3515 unsigned int n_field_vars, 3516 unsigned int field_var_str_start) 3517 { 3518 struct hist_elt_data *elt_data = elt->private_data; 3519 unsigned int i, j, var_idx; 3520 u64 var_val; 3521 3522 for (i = 0, j = field_var_str_start; i < n_field_vars; i++) { 3523 struct field_var *field_var = field_vars[i]; 3524 struct hist_field *var = field_var->var; 3525 struct hist_field *val = field_var->val; 3526 3527 var_val = val->fn(val, elt, rbe, rec); 3528 var_idx = var->var.idx; 3529 3530 if (val->flags & HIST_FIELD_FL_STRING) { 3531 char *str = elt_data->field_var_str[j++]; 3532 char *val_str = (char *)(uintptr_t)var_val; 3533 unsigned int size; 3534 3536 strscpy(str, val_str, size); 3537 var_val = (u64)(uintptr_t)str; 3538 } 3539 tracing_map_set_var(elt, var_idx, var_val); 3540 } 3541 } 3542 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org