Back to index

glibc  2.9
Functions
dl-caller.c File Reference
#include <assert.h>
#include <ldsodefs.h>
#include <stddef.h>
#include <caller.h>
#include <gnu/lib-names.h>

Go to the source code of this file.

Functions

int attribute_hidden _dl_check_caller (const void *caller, enum allowmask mask)

Function Documentation

int attribute_hidden _dl_check_caller ( const void *  caller,
enum allowmask  mask 
)

Definition at line 29 of file dl-caller.c.

{
  static const char expected1[] = LIBC_SO;
  static const char expected2[] = LIBDL_SO;
#ifdef LIBPTHREAD_SO
  static const char expected3[] = LIBPTHREAD_SO;
#endif
  static const char expected4[] = LD_SO;

  for (Lmid_t ns = 0; ns < DL_NNS; ++ns)
    for (struct link_map *l = GL(dl_ns)[ns]._ns_loaded; l != NULL;
        l = l->l_next)
      if (caller >= (const void *) l->l_map_start
         && caller < (const void *) l->l_text_end)
       {
         /* The address falls into this DSO's address range.  Check the
            name.  */
         if ((mask & allow_libc) && strcmp (expected1, l->l_name) == 0)
           return 0;
         if ((mask & allow_libdl) && strcmp (expected2, l->l_name) == 0)
           return 0;
#ifdef LIBPTHREAD_SO
         if ((mask & allow_libpthread) && strcmp (expected3, l->l_name) == 0)
           return 0;
#endif
         if ((mask & allow_ldso) && strcmp (expected4, l->l_name) == 0)
           return 0;

         struct libname_list *runp = l->l_libname;

         while (runp != NULL)
           {
             if ((mask & allow_libc) && strcmp (expected1, runp->name) == 0)
              return 0;
             if ((mask & allow_libdl) && strcmp (expected2, runp->name) == 0)
              return 0;
#ifdef LIBPTHREAD_SO
             if ((mask & allow_libpthread)
                && strcmp (expected3, runp->name) == 0)
              return 0;
#endif
             if ((mask & allow_ldso) && strcmp (expected4, runp->name) == 0)
              return 0;

             runp = runp->next;
           }

         break;
       }

  /* Maybe the dynamic linker is not yet on the list.  */
  if ((mask & allow_ldso) != 0
      && caller >= (const void *) GL(dl_rtld_map).l_map_start
      && caller < (const void *) GL(dl_rtld_map).l_text_end)
    return 0;

  /* No valid caller.  */
  return 1;
}

Here is the call graph for this function: