+ int sym_type = ELF64_ST_TYPE(sym->st_info);
+ int sym_bind = ELF64_ST_BIND(sym->st_info);
+ int sym_vis = ELF64_ST_VISIBILITY(sym->st_other);
+
+ if (i == 0) {
+ if (sym->st_name != 0 || sym->st_info != 0
+ || sym->st_other != 0 || sym->st_shndx != 0
+ || sym->st_value != 0 || sym->st_size != 0) {
+ pr_warn("ELF sym #0 is invalid in %s\n", obj->filename);
+ return -EINVAL;
+ }
+ continue;
+ }
+ if (sym_bind != STB_LOCAL && sym_bind != STB_GLOBAL && sym_bind != STB_WEAK) {
+ pr_warn("ELF sym #%d in section #%zu has unsupported symbol binding %d\n",
+ i, sec->sec_idx, sym_bind);
+ return -EINVAL;
+ }
+ if (sym_vis != STV_DEFAULT && sym_vis != STV_HIDDEN) {
+ pr_warn("ELF sym #%d in section #%zu has unsupported symbol visibility %d\n",
+ i, sec->sec_idx, sym_vis);
+ return -EINVAL;
+ }
+ if (sym->st_shndx == 0) {
+ if (sym_type != STT_NOTYPE || sym_bind == STB_LOCAL
+ || sym->st_value != 0 || sym->st_size != 0) {
+ pr_warn("ELF sym #%d is invalid extern symbol in %s\n",
+ i, obj->filename);
+
+ return -EINVAL;
+ }
+ continue;
+ }
+ if (sym->st_shndx < SHN_LORESERVE && sym->st_shndx >= obj->sec_cnt) {