* missing/explicit_bzero.c: new file. define explicit_bzero.

* common.mk: add a rule for explicit.o.
* configure.in: detect explicit_bzero and memset_s.
* include/ruby/missing.h: add explicit_bzero.
* random.c (init_randomseed): use explicit_bzero() instead of
  memset(). memset could be eliminated by compiler optimization.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52806 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,12 @@
+Sun Oct 18 17:26:53 2015  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* missing/explicit_bzero.c: new file. define explicit_bzero.
+	* common.mk: add a rule for explicit.o.
+	* configure.in: detect explicit_bzero and memset_s.
+	* include/ruby/missing.h: add explicit_bzero.
+	* random.c (init_randomseed): use explicit_bzero() instead of
+	  memset(). memset could be eliminated by compiler optimization.
+
 Mon Nov 30 18:46:44 2015  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* ext/readline/extconf.rb: call dir_config("libedit")

common.mk

@@ -705,6 +705,7 @@ alloca.$(OBJEXT): {$(VPATH)}alloca.c {$(VPATH)}config.h
 crypt.$(OBJEXT): {$(VPATH)}crypt.c
 dup2.$(OBJEXT): {$(VPATH)}dup2.c
 erf.$(OBJEXT): {$(VPATH)}erf.c
+explicit_bzero.$(OBJEXT): {$(VPATH)}explicit_bzero.c
 finite.$(OBJEXT): {$(VPATH)}finite.c
 flock.$(OBJEXT): {$(VPATH)}flock.c
 memcmp.$(OBJEXT): {$(VPATH)}memcmp.c

configure.in

@@ -2127,6 +2127,7 @@ AC_REPLACE_FUNCS(cbrt)
 AC_REPLACE_FUNCS(crypt)
 AC_REPLACE_FUNCS(dup2)
 AC_REPLACE_FUNCS(erf)
+AC_REPLACE_FUNCS(explicit_bzero)
 AC_REPLACE_FUNCS(ffs)
 AC_REPLACE_FUNCS(finite)
 AC_REPLACE_FUNCS(flock)
@@ -2255,6 +2256,7 @@ AC_CHECK_FUNCS(malloc_usable_size)
 AC_CHECK_FUNCS(malloc_size)
 AC_CHECK_FUNCS(mblen)
 AC_CHECK_FUNCS(memalign)
+AC_CHECK_FUNCS(memset_s)
 AC_CHECK_FUNCS(writev)
 AC_CHECK_FUNCS(memrchr)
 AC_CHECK_FUNCS(memmem)

include/ruby/missing.h

@@ -242,6 +242,10 @@ RUBY_EXTERN int ruby_close(int);
 RUBY_EXTERN void setproctitle(const char *fmt, ...);
 #endif
 
+#ifndef HAVE_EXPLICIT_BZERO
+RUBY_EXTERN void explicit_bzero(void *b, size_t len);
+#endif
+
 RUBY_SYMBOL_EXPORT_END
 
 #if defined(__cplusplus)

random.c

@@ -1456,7 +1456,7 @@ init_randomseed(struct MT *mt, uint32_t initial[DEFAULT_SEED_CNT])
     fill_random_seed(initial);
     init_by_array(mt, initial, DEFAULT_SEED_CNT);
     seed = make_seed_value(initial);
-    memset(initial, 0, DEFAULT_SEED_LEN);
+    explicit_bzero(initial, DEFAULT_SEED_LEN);
     return seed;
 }