[ 50/75] x86, boot: Restrict CFLAGS for hostprogs

[Greg KH]

3.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Matt Fleming <matt.fleming@xxxxxxxxx>

commit d40f833630a1299fd377408dc8d8fac370d621b0 upstream.

Currently tools/build has access to all the kernel headers in
$(srctree). This is unnecessary and could potentially allow
tools/build to erroneously include kernel headers when it should only
be including userspace-exported headers.

Unfortunately, mkcpustr still needs access to some of the asm kernel
headers, so explicitly special case that hostprog.

Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1330436245-24875-5-git-send-email-matt@xxxxxxxxxxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/x86/boot/Makefile |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/arch/x86/boot/Makefile
+++ b/arch/x86/boot/Makefile
@@ -37,8 +37,9 @@ setup-y		+= video-bios.o
 targets		+= $(setup-y)
 hostprogs-y	:= mkcpustr tools/build
 
-HOST_EXTRACFLAGS += $(LINUXINCLUDE)
-
+HOSTCFLAGS_mkcpustr.o := -I$(srctree)/arch/$(SRCARCH)/include
+HOST_EXTRACFLAGS += -I$(objtree)/include -I$(srctree)/tools/include \
+                   -include $(srctree)/include/linux/kconfig.h
 $(obj)/cpu.o: $(obj)/cpustr.h
 
 quiet_cmd_cpustr = CPUSTR  $@


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