- (djm) [configure.ac aclocal.m4] More tests to detect fallout from
platform hardening options: include some long long int arithmatic to detect missing support functions for -ftrapv in libgcc and equivalents, actually test linking when -ftrapv is supplied and set either both -pie/-fPIE or neither. feedback and ok dtucker@
This commit is contained in:
Damien Miller
parent
852472a54b
commit
5c2ff5e31f
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@ -4,6 +4,11 @@
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hack surprises us by providing a setproctitle in libc; ok dtucker
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- (djm) [configure.ac] Unless specifically requested, only attempt
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to build Position Independent Executables on gcc >= 4.x; ok dtucker
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- (djm) [configure.ac aclocal.m4] More tests to detect fallout from
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platform hardening options: include some long long int arithmatic
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to detect missing support functions for -ftrapv in libgcc and
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equivalents, actually test linking when -ftrapv is supplied and
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set either both -pie/-fPIE or neither. feedback and ok dtucker@
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20140121
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- (dtucker) [configure.ac] Make PIE a configure-time option which defaults
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@ -1,4 +1,4 @@
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dnl $Id: aclocal.m4,v 1.12 2014/01/21 02:10:27 djm Exp $
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dnl $Id: aclocal.m4,v 1.13 2014/01/22 10:30:12 djm Exp $
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dnl
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dnl OpenSSH-specific autoconf macros
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dnl
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@ -21,7 +21,45 @@ int main(int argc, char **argv) {
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int i = 123 * argc, j = 456 + argc, k = 789 - argc;
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float l = i * 2.1;
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double m = l / 0.5;
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printf("%d %d %d %f %f\n", i, j, k, l, m);
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long long int n = argc * 12345LL, o = 12345LL * (long long int)argc;
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printf("%d %d %d %f %f %lld %lld\n", i, j, k, l, m, n, o);
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exit(0);
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}
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]])],
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[
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if `grep -i "unrecognized option" conftest.err >/dev/null`
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then
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AC_MSG_RESULT([no])
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CFLAGS="$saved_CFLAGS"
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else
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AC_MSG_RESULT([yes])
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CFLAGS="$saved_CFLAGS $_define_flag"
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fi],
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[ AC_MSG_RESULT([no])
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CFLAGS="$saved_CFLAGS" ]
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)
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}])
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dnl OSSH_CHECK_CFLAG_LINK(check_flag[, define_flag])
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dnl Check that $CC accepts a flag 'check_flag'. If it is supported append
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dnl 'define_flag' to $CFLAGS. If 'define_flag' is not specified, then append
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dnl 'check_flag'.
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AC_DEFUN([OSSH_CHECK_CFLAG_LINK], [{
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AC_MSG_CHECKING([if $CC supports compile flag $1 and linking succeeds])
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saved_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS $WERROR $1"
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_define_flag="$2"
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test "x$_define_flag" = "x" && _define_flag="$1"
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AC_LINK_IFELSE([AC_LANG_SOURCE([[
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#include <stdlib.h>
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#include <stdio.h>
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int main(int argc, char **argv) {
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/* Some math to catch -ftrapv problems in the toolchain */
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int i = 123 * argc, j = 456 + argc, k = 789 - argc;
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float l = i * 2.1;
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double m = l / 0.5;
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long long int n = argc * 12345LL, o = 12345LL * (long long int)argc;
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printf("%d %d %d %f %f %lld %lld\n", i, j, k, l, m, n, o);
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exit(0);
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}
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]])],
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@ -57,7 +95,8 @@ int main(int argc, char **argv) {
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int i = 123 * argc, j = 456 + argc, k = 789 - argc;
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float l = i * 2.1;
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double m = l / 0.5;
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printf("%d %d %d %f %f\n", i, j, k, l, m);
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long long int n = argc * 12345LL, o = 12345LL * (long long int)argc;
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printf("%d %d %d %f %f %lld %lld\n", i, j, k, l, m, n, o);
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exit(0);
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}
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]])],
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23
configure.ac
23
configure.ac
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@ -1,4 +1,4 @@
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# $Id: configure.ac,v 1.557 2014/01/22 05:31:18 djm Exp $
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# $Id: configure.ac,v 1.558 2014/01/22 10:30:13 djm Exp $
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#
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# Copyright (c) 1999-2004 Damien Miller
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#
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@ -15,7 +15,7 @@
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# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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AC_INIT([OpenSSH], [Portable], [openssh-unix-dev@mindrot.org])
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AC_REVISION($Revision: 1.557 $)
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AC_REVISION($Revision: 1.558 $)
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AC_CONFIG_SRCDIR([ssh.c])
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AC_LANG([C])
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@ -164,10 +164,15 @@ if test "$GCC" = "yes" || test "$GCC" = "egcs"; then
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OSSH_CHECK_CFLAG_COMPILE([-fno-strict-aliasing])
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OSSH_CHECK_CFLAG_COMPILE([-D_FORTIFY_SOURCE=2])
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if test "x$use_toolchain_hardening" = "x1"; then
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OSSH_CHECK_CFLAG_COMPILE([-ftrapv])
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OSSH_CHECK_LDFLAG_LINK([-Wl,-z,relro])
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OSSH_CHECK_LDFLAG_LINK([-Wl,-z,now])
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OSSH_CHECK_LDFLAG_LINK([-Wl,-z,noexecstack])
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# NB. -ftrapv expects certain support functions to be present in
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# the compiler library (libgcc or similar) to detect integer operations
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# that can overflow. We must check that the result of enabling it
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# actually links. The test program compiled/linked includes a number
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# of integer operations that should exercise this.
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OSSH_CHECK_CFLAG_LINK([-ftrapv])
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fi
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AC_MSG_CHECKING([gcc version])
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GCC_VER=`$CC -v 2>&1 | $AWK '/gcc version /{print $3}'`
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@ -1594,8 +1599,20 @@ if test "x$use_pie" == "xauto"; then
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)
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fi
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if test "x$use_pie" != "xno"; then
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SAVED_CFLAGS="$CFLAGS"
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SAVED_LDFLAGS="$LDFLAGS"
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OSSH_CHECK_CFLAG_COMPILE([-fPIE])
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OSSH_CHECK_LDFLAG_LINK([-pie])
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# We use both -fPIE and -pie or neither.
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AC_MSG_CHECKING([whether both -fPIE and -pie are supported])
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if echo "x $CFLAGS" | grep ' -fPIE' >/dev/null 2>&1 && \
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echo "x $LDFLAGS" | grep ' -pie' >/dev/null 2>&1 ; then
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AC_MSG_RESULT([yes])
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else
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AC_MSG_RESULT([no])
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CFLAGS="$SAVED_CFLAGS"
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LDFLAGS="$SAVED_LDFLAGS"
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fi
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fi
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dnl Checks for library functions. Please keep in alphabetical order
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