1 files changed, 28 insertions, 8 deletions

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 569e68410d7a..c4b5398687b8 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -686,6 +686,30 @@ static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr,
         return NULL;
 }
 
+static inline int is_arm_mapping_symbol(const char *str)
+{
+        return str[0] == '$' && strchr("atd", str[1])
+               && (str[2] == '\0' || str[2] == '.');
+}
+
+/*
+ * If there's no name there, ignore it; likewise, ignore it if it's
+ * one of the magic symbols emitted used by current ARM tools.
+ *
+ * Otherwise if find_symbols_between() returns those symbols, they'll
+ * fail the whitelist tests and cause lots of false alarms ... fixable
+ * only by merging __exit and __init sections into __text, bloating
+ * the kernel (which is especially evil on embedded platforms).
+ */
+static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
+{
+        const char *name = elf->strtab + sym->st_name;
+
+        if (!name || !strlen(name))
+                return 0;
+        return !is_arm_mapping_symbol(name);
+}
+
 /*
  * Find symbols before or equal addr and after addr - in the section sec.
  * If we find two symbols with equal offset prefer one with a valid name.
@@ -714,16 +738,15 @@ static void find_symbols_between(struct elf_info *elf, Elf_Addr addr,
                 symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name;
                 if (strcmp(symsec, sec) != 0)
                         continue;
+                if (!is_valid_name(elf, sym))
+                        continue;
                 if (sym->st_value <= addr) {
                         if ((addr - sym->st_value) < beforediff) {
                                 beforediff = addr - sym->st_value;
                                 *before = sym;
                         }
                         else if ((addr - sym->st_value) == beforediff) {
-                                /* equal offset, valid name? */
-                                const char *name = elf->strtab + sym->st_name;
-                                if (name && strlen(name))
-                                        *before = sym;
+                                *before = sym;
                         }
                 }
                 else
@@ -733,10 +756,7 @@ static void find_symbols_between(struct elf_info *elf, Elf_Addr addr,
                                 *after = sym;
                         }
                         else if ((sym->st_value - addr) == afterdiff) {
-                                /* equal offset, valid name? */
-                                const char *name = elf->strtab + sym->st_name;
-                                if (name && strlen(name))
-                                        *after = sym;
+                                *after = sym;
                         }
                 }
         }