src/patches/busybox-0.60.5-insmod_gpl_symbols.patch

   1 Adds support for GPL symbols (those exported with EXPORT_SYMBOL_GPL instead
   2 of EXPORT_SYMBOL) to insmod. This is a backport from later busybox versions,
   3 it corresponds to revision 7301 in the busybox svn repository:
   4
   5 http://www.busybox.net/cgi-bin/viewcvs.cgi/trunk/busybox/modutils/insmod.c?rev=7301&view=markup
   6 --- busybox-0.60.5/insmod.c     2002-09-16 06:30:10.000000000 +0100
   7 +++ busybox-0.60.5-symbols/insmod.c     2005-06-21 20:58:57.000000000 +0100
   8 @@ -607,6 +607,8 @@
   9
  10  static void arch_create_got (struct obj_file *f);
  11
  12 +static int obj_gpl_license(struct obj_file *f, const char **license);
  13 +
  14  #ifdef BB_FEATURE_NEW_MODULE_INTERFACE
  15  static int arch_init_module (struct obj_file *f, struct new_module *);
  16  #endif
  17 @@ -1710,12 +1712,29 @@
  18         size_t i;
  19         int used = 0;
  20
  21 +       int gpl;
  22 +       gpl = obj_gpl_license(f, NULL) == 0;
  23 +
  24         for (i = 0, s = syms; i < nsyms; ++i, ++s) {
  25
  26                 /* Only add symbols that are already marked external.  If we
  27                    override locals we may cause problems for argument initialization.
  28                    We will also create a false dependency on the module.  */
  29                 struct obj_symbol *sym;
  30 +               char *name;
  31 +
  32 +               /* GPL licensed modules can use symbols exported with
  33 +                * EXPORT_SYMBOL_GPL, so ignore any GPLONLY_ prefix on the
  34 +                * exported names.  Non-GPL modules never see any GPLONLY_
  35 +                * symbols so they cannot fudge it by adding the prefix on
  36 +                * their references.
  37 +                */
  38 +               if (strncmp((char *)s->name, "GPLONLY_", 8) == 0) {
  39 +                       if (gpl)
  40 +                               ((char *)s->name) += 8;
  41 +                       else
  42 +                               continue;
  43 +               }
  44
  45                 sym = obj_find_symbol(f, (char *) s->name);
  46                 if (sym && !ELFW(ST_BIND) (sym->info) == STB_LOCAL) {