Merge pull request facebook#12 from mringwal/master

Also rebind symbols in __DATA_CONST segment

fishhook.c

@@ -45,6 +45,10 @@ typedef struct nlist nlist_t;
 #define LC_SEGMENT_ARCH_DEPENDENT LC_SEGMENT
 #endif
 
+#ifndef SEG_DATA_CONST
+#define SEG_DATA_CONST  "__DATA_CONST"
+#endif
+
 struct rebindings_entry {
   struct rebinding *rebindings;
   size_t rebindings_nel;
@@ -147,7 +151,8 @@ static void rebind_symbols_for_image(struct rebindings_entry *rebindings,
   for (uint i = 0; i < header->ncmds; i++, cur += cur_seg_cmd->cmdsize) {
     cur_seg_cmd = (segment_command_t *)cur;
     if (cur_seg_cmd->cmd == LC_SEGMENT_ARCH_DEPENDENT) {
-      if (strcmp(cur_seg_cmd->segname, SEG_DATA) != 0) {
+      if (strcmp(cur_seg_cmd->segname, SEG_DATA) != 0 &&
+          strcmp(cur_seg_cmd->segname, SEG_DATA_CONST) != 0) {
         continue;
       }
       for (uint j = 0; j < cur_seg_cmd->nsects; j++) {