From 048625cf2b36a91bcf04c5a1adc02fc5803491ca Mon Sep 17 00:00:00 2001
From: kinichiro <kinichiro.inoguchi@gmail.com>
Date: Sat, 22 Apr 2017 23:08:17 +0900
Subject: Add freezero support
---
.gitignore | 1 +
crypto/CMakeLists.txt | 5 +++++
crypto/Makefile.am | 4 ++++
crypto/compat/freezero.c | 13 +++++++++++++
include/compat/stdlib.h | 4 ++++
m4/check-libc.m4 | 8 ++++++--
6 files changed, 33 insertions(+), 2 deletions(-)
create mode 100644 crypto/compat/freezero.c
diff --git a/.gitignore b/.gitignore
index 85bbe6e..f8b728c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -143,6 +143,7 @@ include/openssl/*.h
!/crypto/compat/arc4random.h
!/crypto/compat/b_win.c
!/crypto/compat/explicit_bzero_win.c
+!/crypto/compat/freezero.c
!/crypto/compat/getpagesize.c
!/crypto/compat/posix_win.c
!/crypto/compat/bsd_asprintf.c
diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index d7b65e2..028d840 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -681,6 +681,11 @@ if(NOT HAVE_ASPRINTF)
set(EXTRA_EXPORT ${EXTRA_EXPORT} vasprintf)
endif()
+if(NOT HAVE_FREEZERO)
+ set(CRYPTO_SRC ${CRYPTO_SRC} compat/freezero.c)
+ set(EXTRA_EXPORT ${EXTRA_EXPORT} freezero)
+endif()
+
if(NOT HAVE_GETPAGESIZE)
set(CRYPTO_SRC ${CRYPTO_SRC} compat/getpagesize.c)
endif()
diff --git a/crypto/Makefile.am b/crypto/Makefile.am
index 04b67aa..0e7f9c8 100644
--- a/crypto/Makefile.am
+++ b/crypto/Makefile.am
@@ -84,6 +84,10 @@ if !HAVE_ASPRINTF
libcompat_la_SOURCES += compat/bsd-asprintf.c
endif
+if !HAVE_FREEZERO
+libcompat_la_SOURCES += compat/freezero.c
+endif
+
if !HAVE_GETPAGESIZE
libcompat_la_SOURCES += compat/getpagesize.c
endif
diff --git a/crypto/compat/freezero.c b/crypto/compat/freezero.c
new file mode 100644
index 0000000..8becc00
--- /dev/null
+++ b/crypto/compat/freezero.c
@@ -0,0 +1,13 @@
+#include <string.h>
+#include <stdlib.h>
+
+void
+freezero(void *ptr, size_t sz)
+{
+ /* This is legal. */
+ if (ptr == NULL)
+ return;
+
+ explicit_bzero(ptr, sz);
+ free(ptr);
+}
diff --git a/include/compat/stdlib.h b/include/compat/stdlib.h
index 11f82ba..cc04856 100644
--- a/include/compat/stdlib.h
+++ b/include/compat/stdlib.h
@@ -25,6 +25,10 @@ void arc4random_buf(void *_buf, size_t n);
uint32_t arc4random_uniform(uint32_t upper_bound);
#endif
+#ifndef HAVE_FREEZERO
+void freezero(void *ptr, size_t sz);
+#endif
+
#ifndef HAVE_REALLOCARRAY
void *reallocarray(void *, size_t, size_t);
#endif
diff --git a/m4/check-libc.m4 b/m4/check-libc.m4
index 066b394..d9b7b88 100644
--- a/m4/check-libc.m4
+++ b/m4/check-libc.m4
@@ -2,11 +2,12 @@ AC_DEFUN([CHECK_LIBC_COMPAT], [
# Check for libc headers
AC_CHECK_HEADERS([err.h readpassphrase.h])
# Check for general libc functions
-AC_CHECK_FUNCS([asprintf getpagesize inet_ntop inet_pton memmem readpassphrase])
-AC_CHECK_FUNCS([reallocarray recallocarray])
+AC_CHECK_FUNCS([asprintf freezero getpagesize inet_ntop inet_pton memmem])
+AC_CHECK_FUNCS([readpassphrase reallocarray recallocarray])
AC_CHECK_FUNCS([strlcat strlcpy strndup strnlen strsep strtonum])
AC_CHECK_FUNCS([timegm _mkgmtime])
AM_CONDITIONAL([HAVE_ASPRINTF], [test "x$ac_cv_func_asprintf" = xyes])
+AM_CONDITIONAL([HAVE_FREEZERO], [test "x$ac_cv_func_freezero" = xyes])
AM_CONDITIONAL([HAVE_GETPAGESIZE], [test "x$ac_cv_func_getpagesize" = xyes])
AM_CONDITIONAL([HAVE_INET_NTOP], [test "x$ac_cv_func_inet_ntop" = xyes])
AM_CONDITIONAL([HAVE_INET_PTON], [test "x$ac_cv_func_inet_pton" = xyes])
@@ -170,6 +171,9 @@ fi
if test "x$ac_cv_func_explicit_bzero" = "xno" ; then
echo explicit_bzero >> $crypto_p_sym
fi
+if test "x$ac_cv_func_freezero" = "xno" ; then
+ echo freezero >> $crypto_p_sym
+fi
if test "x$ac_cv_func_inet_pton" = "xno" ; then
echo inet_pton >> $crypto_p_sym
fi
--
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