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| author | Damien Miller <djm@mindrot.org> | 2024-03-06 10:33:20 +1100 |
|---|---|---|
| committer | Damien Miller <djm@mindrot.org> | 2024-03-06 10:33:20 +1100 |
| commit | 668d270a6c77e8b5a1da26ecad2e6de9f62c8fe4 (patch) | |
| tree | 775989c8b133d4593bf4e0b7a058ab8e68c44d24 | |
| parent | 3deb501f86fc47e175ef6a3eaba9b9846a80d444 (diff) | |
add a --without-retpoline configure option
discussed with deraadt and dtucker a while ago
| -rw-r--r-- | configure.ac | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac index fda09283..c1af4b42 100644 --- a/configure.ac +++ b/configure.ac @@ -149,6 +149,7 @@ fi use_stack_protector=1 use_toolchain_hardening=1 +use_retpoline=1 AC_ARG_WITH([stackprotect], [ --without-stackprotect Don't use compiler's stack protection], [ if test "x$withval" = "xno"; then @@ -159,6 +160,11 @@ AC_ARG_WITH([hardening], if test "x$withval" = "xno"; then use_toolchain_hardening=0 fi ]) +AC_ARG_WITH([retpoline], + [ --without-retpoline Enable retpoline spectre mitigation], [ + if test "x$withval" = "xno"; then + use_retpoline=0 + fi ]) # We use -Werror for the tests only so that we catch warnings like "this is # on by default" for things like -fPIE. @@ -216,8 +222,6 @@ if test "$GCC" = "yes" || test "$GCC" = "egcs"; then OSSH_CHECK_CFLAG_COMPILE([-Wbitwise-instead-of-logical]) OSSH_CHECK_CFLAG_COMPILE([-fno-strict-aliasing]) if test "x$use_toolchain_hardening" = "x1"; then - OSSH_CHECK_CFLAG_COMPILE([-mretpoline]) # clang - OSSH_CHECK_LDFLAG_LINK([-Wl,-z,retpolineplt]) OSSH_CHECK_CFLAG_COMPILE([-D_FORTIFY_SOURCE=2]) OSSH_CHECK_LDFLAG_LINK([-Wl,-z,relro]) OSSH_CHECK_LDFLAG_LINK([-Wl,-z,now]) @@ -240,6 +244,10 @@ if test "$GCC" = "yes" || test "$GCC" = "egcs"; then esac OSSH_CHECK_CFLAG_COMPILE([-ftrivial-auto-var-init=zero]) fi + if test "x$use_retpoline" = "x1"; then + OSSH_CHECK_CFLAG_COMPILE([-mretpoline]) # clang + OSSH_CHECK_LDFLAG_LINK([-Wl,-z,retpolineplt]) + fi AC_MSG_CHECKING([if $CC accepts -fno-builtin-memset]) saved_CFLAGS="$CFLAGS" |