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override native arc4random_buf on OS X

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While the native OS X implementation is fork-safe, it does not seed
safely, as of the latest released OS X libc sources, version 997.90.3.
It only uses weak sources of entropy if accessing /dev/urandom fails.

ok beck@ deraadt@
This commit is contained in:
Brent Cook 2014-10-27 20:01:21 -05:00
parent e864776f0b
commit 8abf8e1e15
1 changed files with 4 additions and 0 deletions
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configure.ac
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@ -79,6 +79,10 @@ AM_CONDITIONAL([HAVE_STRTONUM], [test "x$ac_cv_func_strtonum" = xyes])
AM_CONDITIONAL([HAVE_TIMINGSAFE_BCMP], [test "x$ac_cv_func_timingsafe_bcmp" = xyes])
AM_CONDITIONAL([HAVE_TIMINGSAFE_MEMCMP], [test "x$ac_cv_func_timingsafe_memcmp" = xyes])
# overrides for arc4random_buf implementations with known issues
AM_CONDITIONAL([HAVE_ARC4RANDOM_BUF],
[test "x$HOST_OS" != xdarwin -a "x$NO_ARC4RANDOM_BUF" = xtrue])
AC_CACHE_CHECK([whether va_copy exists], ac_cv_have_va_copy, [
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <stdarg.h>