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Message-ID: <152054012926.30108.1396081321561419564.stgit@magnolia>
Date: Thu, 08 Mar 2018 12:15:29 -0800
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: tytso@....edu, darrick.wong@...cle.com
Cc: linux-ext4@...r.kernel.org
Subject: [PATCH 2/4] misc: enable UBSAN if the builder wants it
From: Darrick J. Wong <darrick.wong@...cle.com>
Enable the undefined behavior sanitizer (ubsan) if the builder requests
it and it's available.
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
MCONFIG.in | 4 ++--
config/ltmain.sh | 1 +
configure | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
configure.ac | 28 ++++++++++++++++++++++++++++
debian/rules | 2 +-
5 files changed, 84 insertions(+), 3 deletions(-)
create mode 120000 config/ltmain.sh
diff --git a/MCONFIG.in b/MCONFIG.in
index f06933d..4234ff0 100644
--- a/MCONFIG.in
+++ b/MCONFIG.in
@@ -81,8 +81,8 @@ SYSTEMD_SYSTEM_UNIT_DIR = @systemd_system_unit_dir@
@ifNotGNUmake@ CHECK_CMD=true
@ifNotGNUmake@ CPPCHECK_CMD=true
-SANITIZER_CFLAGS = @lto_cflags@
-SANITIZER_LDFLAGS = @lto_ldflags@
+SANITIZER_CFLAGS = @lto_cflags@ @ubsan_cflags@
+SANITIZER_LDFLAGS = @lto_ldflags@ @ubsan_ldflags@
CC = @CC@
BUILD_CC = @BUILD_CC@
diff --git a/config/ltmain.sh b/config/ltmain.sh
new file mode 120000
index 0000000..8cff389
--- /dev/null
+++ b/config/ltmain.sh
@@ -0,0 +1 @@
+/usr/share/libtool/build-aux/ltmain.sh
\ No newline at end of file
diff --git a/configure b/configure
index 5947614..7632a4a 100755
--- a/configure
+++ b/configure
@@ -653,6 +653,9 @@ E2SCRUB_CMT
UNIX_CMT
CYGWIN_CMT
LINUX_CMT
+ubsan_ldflags
+ubsan_cflags
+have_ubsan
lto_ldflags
lto_cflags
have_lto
@@ -909,6 +912,7 @@ with_included_gettext
with_libintl_prefix
enable_fuse2fs
enable_lto
+enable_ubsan
with_multiarch
with_udev_rules_dir
with_crond_dir
@@ -1588,6 +1592,7 @@ Optional Features:
--disable-rpath do not hardcode runtime library paths
--disable-fuse2fs do not build fuse2fs
--enable-lto enable link time optimization
+ --enable-ubsan enable undefined behavior sanitizer
Optional Packages:
--with-PACKAGE[=ARG] use PACKAGE [ARG=yes]
@@ -13865,6 +13870,53 @@ fi
if test "$enable_lto" = "yes" && test "$have_lto" != "yes"; then
as_fn_error $? "LTO not supported by compiler." "$LINENO" 5
fi
+# Check whether --enable-ubsan was given.
+if test "${enable_ubsan+set}" = set; then :
+ enableval=$enable_ubsan;
+else
+ enable_ubsan=no
+fi
+
+if test "$enable_ubsan" = "yes" || test "$enable_ubsan" = "probe"; then
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking if C compiler supports UBSAN" >&5
+$as_echo_n "checking if C compiler supports UBSAN... " >&6; }
+ OLD_CFLAGS="$CFLAGS"
+ OLD_LDFLAGS="$LDFLAGS"
+ UBSAN_FLAGS="-fsanitize=undefined"
+ CFLAGS="$CFLAGS $UBSAN_FLAGS"
+ LDFLAGS="$LDFLAGS $UBSAN_FLAGS"
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+int
+main ()
+{
+
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+ ubsan_cflags=$UBSAN_FLAGS
+ ubsan_ldflags=$UBSAN_FLAGS
+ have_ubsan=yes
+else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+rm -f core conftest.err conftest.$ac_objext \
+ conftest$ac_exeext conftest.$ac_ext
+ CFLAGS="${OLD_CFLAGS}"
+ LDFLAGS="${OLD_LDFLAGS}"
+
+
+
+fi
+if test "$enable_ubsan" = "yes" && test "$have_ubsan" != "yes"; then
+ as_fn_error $? "UBSAN not supported by compiler." "$LINENO" 5
+fi
LINUX_CMT="#"
CYGWIN_CMT="#"
UNIX_CMT=
diff --git a/configure.ac b/configure.ac
index a605aad..981c6b0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1329,6 +1329,34 @@ if test "$enable_lto" = "yes" && test "$have_lto" != "yes"; then
AC_MSG_ERROR([LTO not supported by compiler.])
fi
dnl
+dnl Enable UBSAN for all packages
+dnl
+AC_ARG_ENABLE([ubsan],
+[ --enable-ubsan enable undefined behavior sanitizer],,
+enable_ubsan=no)
+if test "$enable_ubsan" = "yes" || test "$enable_ubsan" = "probe"; then
+ AC_MSG_CHECKING([if C compiler supports UBSAN])
+ OLD_CFLAGS="$CFLAGS"
+ OLD_LDFLAGS="$LDFLAGS"
+ UBSAN_FLAGS="-fsanitize=undefined"
+ CFLAGS="$CFLAGS $UBSAN_FLAGS"
+ LDFLAGS="$LDFLAGS $UBSAN_FLAGS"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
+ [AC_MSG_RESULT([yes])]
+ [ubsan_cflags=$UBSAN_FLAGS]
+ [ubsan_ldflags=$UBSAN_FLAGS]
+ [have_ubsan=yes],
+ [AC_MSG_RESULT([no])])
+ CFLAGS="${OLD_CFLAGS}"
+ LDFLAGS="${OLD_LDFLAGS}"
+ AC_SUBST(have_ubsan)
+ AC_SUBST(ubsan_cflags)
+ AC_SUBST(ubsan_ldflags)
+fi
+if test "$enable_ubsan" = "yes" && test "$have_ubsan" != "yes"; then
+ AC_MSG_ERROR([UBSAN not supported by compiler.])
+fi
+dnl
dnl OS-specific uncomment control
dnl
LINUX_CMT="#"
diff --git a/debian/rules b/debian/rules
index 176ea78..600b751 100755
--- a/debian/rules
+++ b/debian/rules
@@ -164,7 +164,7 @@ endif
BACKTRACE_CONF_FLAGS ?= $(shell if ${debdir}/scripts/test-backtrace ; then echo --disable-backtrace ; fi)
-COMMON_CONF_FLAGS = --enable-lto --disable-e2initrd-helper \
+COMMON_CONF_FLAGS = --enable-lto --disable-ubsan --disable-e2initrd-helper \
--infodir=/usr/share/info --enable-symlink-install \
--with-multiarch=$(DEB_HOST_MULTIARCH) \
$(BACKTRACE_CONF_FLAGS) $(UTIL_CONF_FLAGS)
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