ld.so: Consolidate 2 strtouls into _dl_strtoul [BZ #21528]

There are 2 minimal strtoul implementations in ld.so:

1. __strtoul_internal in elf/dl-minimal.c.
2. tunables_strtoul in elf/dl-tunables.c.

This patch adds _dl_strtoul to replace them.  Tested builds with and
without --enable-tunables.

	[BZ #21528]
	* elf/dl-minimal.c (__strtoul_internal): Removed.
	(strtoul): Likewise.
	* elf/dl-misc.c (_dl_strtoul): New function.
	* elf/dl-tunables.c (tunables_strtoul): Removed.
	(tunable_initialize): Replace tunables_strtoul with _dl_strtoul.
	* elf/rtld.c (process_envvars): Likewise.
	* sysdeps/unix/sysv/linux/dl-librecon.h (_dl_osversion_init):
	Likewise.
	* sysdeps/generic/ldsodefs.h (_dl_strtoul): New prototype.

1 files changed, 1 insertions, 68 deletions

diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c
index 76e8c5cae1..b3c1392ce4 100644
--- a/elf/dl-tunables.c
+++ b/elf/dl-tunables.c
@@ -102,73 +102,6 @@ get_next_env (char **envp, char **name, size_t *namelen, char **val,
   return NULL;
 }
 
-/* A stripped down strtoul-like implementation for very early use.  It does not
-   set errno if the result is outside bounds because it gets called before
-   errno may have been set up.  */
-static uint64_t
-tunables_strtoul (const char *nptr)
-{
-  uint64_t result = 0;
-  long int sign = 1;
-  unsigned max_digit;
-
-  while (*nptr == ' ' || *nptr == '\t')
-    ++nptr;
-
-  if (*nptr == '-')
-    {
-      sign = -1;
-      ++nptr;
-    }
-  else if (*nptr == '+')
-    ++nptr;
-
-  if (*nptr < '0' || *nptr > '9')
-    return 0UL;
-
-  int base = 10;
-  max_digit = 9;
-  if (*nptr == '0')
-    {
-      if (nptr[1] == 'x' || nptr[1] == 'X')
-	{
-	  base = 16;
-	  nptr += 2;
-	}
-      else
-	{
-	  base = 8;
-	  max_digit = 7;
-	}
-    }
-
-  while (1)
-    {
-      int digval;
-      if (*nptr >= '0' && *nptr <= '0' + max_digit)
-        digval = *nptr - '0';
-      else if (base == 16)
-        {
-	  if (*nptr >= 'a' && *nptr <= 'f')
-	    digval = *nptr - 'a' + 10;
-	  else if (*nptr >= 'A' && *nptr <= 'F')
-	    digval = *nptr - 'A' + 10;
-	  else
-	    break;
-	}
-      else
-        break;
-
-      if (result >= (UINT64_MAX - digval) / base)
-	return UINT64_MAX;
-      result *= base;
-      result += digval;
-      ++nptr;
-    }
-
-  return result * sign;
-}
-
 #define TUNABLE_SET_VAL_IF_VALID_RANGE(__cur, __val, __type, __default_min, \
 				       __default_max)			      \
 ({									      \
@@ -233,7 +166,7 @@ tunable_initialize (tunable_t *cur, const char *strval)
 
   if (cur->type.type_code != TUNABLE_TYPE_STRING)
     {
-      val = tunables_strtoul (strval);
+      val = _dl_strtoul (strval, NULL);
       valp = &val;
     }
   else