Commit 64f62881 authored by Nick Mathewson's avatar Nick Mathewson 🥄
Browse files

New --enable-expensive-hardening option

It turns on -fsanitize=address and -fsanitize=ubsan if they work.

Most relays won't want this. Some clients may.  Ticket 11477.
parent 08200314
o Minor features:
- New --enable-expensive-hardening option to turn on security hardening
options that consume nontrivial amounts of CPU and memory. Right now,
this includes AddressSanitizer and UbSan. Closes ticket 11477.
......@@ -129,13 +129,13 @@ AC_ARG_ENABLE(gcc-warnings,
AC_ARG_ENABLE(gcc-warnings-advisory,
AS_HELP_STRING(--enable-gcc-warnings-advisory, [enable verbose warnings, excluding -Werror]))
dnl Adam shostack suggests the following for Windows:
dnl -D_FORTIFY_SOURCE=2 -fstack-protector-all
dnl Others suggest '/gs /safeseh /nxcompat /dynamicbase' for non-gcc on Windows
dnl This requires that we use gcc and that we add -O2 to the CFLAGS.
AC_ARG_ENABLE(gcc-hardening,
AS_HELP_STRING(--disable-gcc-hardening, disable compiler security checks))
AC_ARG_ENABLE(expensive-hardening,
AS_HELP_STRING(--enable-expensive-hardening, enable more expensive compiler hardening; makes Tor slower))
dnl Linker hardening options
dnl Currently these options are ELF specific - you can't use this with MacOSX
AC_ARG_ENABLE(linker-hardening,
......@@ -628,6 +628,12 @@ if test x$enable_gcc_hardening != xno; then
fi
fi
if test x$enable_expensive_hardening = xyes ; then
TOR_CHECK_CFLAGS([-fsanitize=address])
TOR_CHECK_CFLAGS([-fsanitize=undefined])
TOR_CHECK_CFLAGS([-fno-omit-frame-pointer])
fi
if test x$enable_linker_hardening != xno; then
TOR_CHECK_LDFLAGS(-z relro -z now, "$all_ldflags_for_check", "$all_libs_for_check")
fi
......@@ -640,10 +646,11 @@ dnl Now see if we have a -fomit-frame-pointer compiler option.
saved_CFLAGS="$CFLAGS"
TOR_CHECK_CFLAGS(-fomit-frame-pointer)
F_OMIT_FRAME_POINTER=''
if test "$saved_CFLAGS" != "$CFLAGS"; then
F_OMIT_FRAME_POINTER='-fomit-frame-pointer'
else
F_OMIT_FRAME_POINTER=''
if test x$enable_expensive_hardening != xyes ; then
F_OMIT_FRAME_POINTER='-fomit-frame-pointer'
fi
fi
CFLAGS="$saved_CFLAGS"
AC_SUBST(F_OMIT_FRAME_POINTER)
......
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