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| author | Darren Tucker <dtucker@dtucker.net> | 2018-02-11 09:32:37 +1100 |
|---|---|---|
| committer | Darren Tucker <dtucker@dtucker.net> | 2018-02-11 09:32:37 +1100 |
| commit | 3377df00ea3fece5293db85fe63baef33bf5152e (patch) | |
| tree | 8bb0afdc52a68c51aa6aed773a9efc4db04ac492 /configure.ac | |
| parent | d9e5cf078ea5380da6df767bb1773802ec557ef0 (diff) | |
Add checks for Spectre v2 mitigation (retpoline)
This adds checks for gcc and clang flags for mitigations for Spectre
variant 2, ie "retpoline". It'll automatically enabled if the compiler
supports it as part of toolchain hardening flag. ok djm@
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 0476398a..71174571 100644 --- a/configure.ac +++ b/configure.ac @@ -163,6 +163,10 @@ if test "$GCC" = "yes" || test "$GCC" = "egcs"; then OSSH_CHECK_CFLAG_COMPILE([-Wunused-result], [-Wno-unused-result]) OSSH_CHECK_CFLAG_COMPILE([-fno-strict-aliasing]) if test "x$use_toolchain_hardening" = "x1"; then + OSSH_CHECK_CFLAG_COMPILE([-mfunction-return=thunk]) # gcc + OSSH_CHECK_CFLAG_COMPILE([-mindirect-branch=thunk]) # gcc + OSSH_CHECK_CFLAG_COMPILE([-mretpoline]) # clang + OSSH_CHECK_CFLAG_LINK([-z retpolineplt]) OSSH_CHECK_CFLAG_COMPILE([-D_FORTIFY_SOURCE=2]) OSSH_CHECK_LDFLAG_LINK([-Wl,-z,relro]) OSSH_CHECK_LDFLAG_LINK([-Wl,-z,now]) |