From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx> As stat() can overflow if a 32 bit user space is running on a 64 bit kernel and the inode is more than 32 bits, compile with _FILE_OFFSET_BITS=64 that mitigates this problem on 32 bit user space. Do this by running the cross compiler cpp and checking what __LONG_SIZE__ is. If it returns 4, then add the define. Reported-by: Mike Frysinger <vapier@xxxxxxxxxx> Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx> --- Makefile | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Makefile b/Makefile index 965ff47eae7d..fd324033f6d7 100644 --- a/Makefile +++ b/Makefile @@ -23,6 +23,7 @@ endef $(call allow-override,CC,$(CROSS_COMPILE)gcc) $(call allow-override,AR,$(CROSS_COMPILE)ar) $(call allow-override,NM,$(CROSS_COMPILE)nm) +$(call allow-override,CPP,$(CROSS_COMPILE)cpp) $(call allow-override,PKG_CONFIG,pkg-config) $(call allow-override,LD_SO_CONF_PATH,/etc/ld.so.conf.d/) $(call allow-override,LDCONFIG,ldconfig) @@ -130,6 +131,11 @@ else CFLAGS := -g -Wall endif +# Make sure 32 bit on 64 bit doesn't have stat() bugs. +ifeq ($(shell echo '' | $(CPP) -dM - | grep __SIZEOF_LONG__ | cut -d' ' -f3),4) + CFLAGS += -D_FILE_OFFSET_BITS=64 +endif + LIBS ?= -ldl export LIBS -- 2.35.1
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