@@ -30,7 +30,7 @@
# define "CXFLAGS" to give extra flags to CC.
# e.g. make CXFLAGS=-O to optimise
-CXFLAGS ?=-O2
+CXFLAGS ?=-O2 -D_FORTIFY_SOURCE=2
TCC = tcc
UCLIBC_GCC = $(shell for nm in i386-uclibc-linux-gcc i386-uclibc-gcc; do which $$nm > /dev/null && { echo $$nm ; exit; } ; done; echo false No uclibc found )
#DIET_GCC = diet gcc
@@ -50,14 +50,30 @@ ifeq ($(origin CC),default)
CC := $(CROSS_COMPILE)gcc
endif
CXFLAGS ?= -ggdb
-CWFLAGS = -Wall -Werror -Wstrict-prototypes -Wextra -Wno-unused-parameter
+CWFLAGS ?= -Wall -Werror -Wstrict-prototypes -Wextra -Wno-unused-parameter -Wformat -Wformat-security -Werror=format-security -fstack-protector-strong -fPIE -Warray-bounds
ifdef WARN_UNUSED
-CWFLAGS += -Wp,-D_FORTIFY_SOURCE=2 -O3
+CWFLAGS += -Wp -O3
endif
-FALLTHROUGH := $(shell gcc -v --help 2>&1 | grep "implicit-fallthrough" | wc -l)
-ifneq "$(FALLTHROUGH)" "0"
-CWFLAGS += -Wimplicit-fallthrough=0
+ifeq ($(origin FALLTHROUGH), undefined)
+ FALLTHROUGH := $(shell gcc -Q --help=warnings 2>&1 | grep "implicit-fallthrough" | wc -l)
+ ifneq "$(FALLTHROUGH)" "0"
+ CWFLAGS += -Wimplicit-fallthrough=0
+ endif
+endif
+
+ifeq ($(origin FORMATOVERFLOW), undefined)
+ FORMATOVERFLOW := $(shell gcc -Q --help=warnings 2>&1 | grep "format-overflow" | wc -l)
+ ifneq "$(FORMATOVERFLOW)" "0"
+ CWFLAGS += -Wformat-overflow
+ endif
+endif
+
+ifeq ($(origin STRINGOPOVERFLOW), undefined)
+ STRINGOPOVERFLOW := $(shell gcc -Q --help=warnings 2>&1 | grep "stringop-overflow" | wc -l)
+ ifneq "$(STRINGOPOVERFLOW)" "0"
+ CWFLAGS += -Wstringop-overflow
+ endif
endif
ifdef DEBIAN
@@ -116,10 +132,12 @@ CFLAGS += -DUSE_PTHREADS
MON_LDFLAGS += -pthread
endif
+LDFLAGS = -Wl,-z,now,-z,noexecstack
+
# If you want a static binary, you might uncomment these
-# LDFLAGS = -static
+# LDFLAGS += -static
# STRIP = -s
-LDLIBS = -ldl
+LDLIBS = -ldl -pie
# To explicitly disable libudev, set -DNO_LIBUDEV in CXFLAGS
ifeq (, $(findstring -DNO_LIBUDEV, $(CXFLAGS)))
@@ -209,14 +227,13 @@ mdadm.Os : $(SRCS) $(INCL)
$(CC) -o mdadm.Os $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -DHAVE_STDINT_H -Os $(SRCS) $(LDLIBS)
mdadm.O2 : $(SRCS) $(INCL) mdmon.O2
- $(CC) -o mdadm.O2 $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -DHAVE_STDINT_H -O2 -D_FORTIFY_SOURCE=2 $(SRCS) $(LDLIBS)
+ $(CC) -o mdadm.O2 $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -DHAVE_STDINT_H -O2 $(SRCS) $(LDLIBS)
mdmon.O2 : $(MON_SRCS) $(INCL) mdmon.h
- $(CC) -o mdmon.O2 $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(MON_LDFLAGS) -DHAVE_STDINT_H -O2 -D_FORTIFY_SOURCE=2 $(MON_SRCS) $(LDLIBS)
+ $(CC) -o mdmon.O2 $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(MON_LDFLAGS) -DHAVE_STDINT_H -O2 $(MON_SRCS) $(LDLIBS)
-# use '-z now' to guarantee no dynamic linker interactions with the monitor thread
mdmon : $(MON_OBJS) | check_rundir
- $(CC) $(CFLAGS) $(LDFLAGS) $(MON_LDFLAGS) -Wl,-z,now -o mdmon $(MON_OBJS) $(LDLIBS)
+ $(CC) $(CFLAGS) $(LDFLAGS) $(MON_LDFLAGS) -o mdmon $(MON_OBJS) $(LDLIBS)
msg.o: msg.c msg.h
test_stripe : restripe.c xmalloc.o mdadm.h
It is essential to avoid buffer overflows and similar bugs as much as possible. According to Intel rules we are obligated to verify certain compiler flags, so it will be much easier if they are added to the Makefile. Add gcc flags for prevention of buffer overflows, format string vulnerabilities, stack protection to prevent stack overwrites and aslr enablement through -fPIE. Also make the flags configurable. The changes were verified on gcc versions 7.5, 8.3, 9.2, 10 and 12.2. Signed-off-by: Mateusz Grzonka <mateusz.grzonka@intel.com> --- Makefile | 41 +++++++++++++++++++++++++++++------------ 1 file changed, 29 insertions(+), 12 deletions(-)