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kbuild: limit dtc+cpp include path 

Device tree source files may now include header files. The intent is
that those header files define/name constants used as part of the DT
bindings. Currently this feature is open to abuse, since any kernel
header file at all can be included, This could allow device tree files
to become dependant on kernel headers files, and thus make them no
longer OS-independent. This would also prevent separating the device
tree source files from the kernel repository.

Solve this by limiting the cpp include path for device tree files to
separate directories.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Stephen Warren 2013-02-12 15:03:37 -07:00 committed by Grant Likely
parent e80beb27d2
commit e570d7c15a
1 changed files with 6 additions and 2 deletions
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8
scripts/Makefile.lib
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@ -156,6 +156,11 @@ cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
ld_flags = $(LDFLAGS) $(ldflags-y) ld_flags = $(LDFLAGS) $(ldflags-y)
dtc_cpp_flags = -Wp,-MD,$(depfile) -nostdinc \
-I$(srctree)/arch/$(SRCARCH)/boot/dts \
-I$(srctree)/arch/$(SRCARCH)/include/dts \
-undef -D__DTS__
# Finds the multi-part object the current object will be linked into # Finds the multi-part object the current object will be linked into
modname-multi = $(sort $(foreach m,$(multi-used),\ modname-multi = $(sort $(foreach m,$(multi-used),\
$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
@ -272,8 +277,7 @@ $(obj)/%.dtb: $(src)/%.dts FORCE
dtc-tmp = $(subst $(comma),_,$(dot-target).dts) dtc-tmp = $(subst $(comma),_,$(dot-target).dts)
quiet_cmd_dtc_cpp = DTC+CPP $@ quiet_cmd_dtc_cpp = DTC+CPP $@
cmd_dtc_cpp = $(CPP) $(cpp_flags) -x assembler-with-cpp -undef -D__DTS__ \ cmd_dtc_cpp = $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
-o $(dtc-tmp) $< ; \
$(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) $(dtc-tmp) $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) $(dtc-tmp)
$(obj)/%.dtb: $(src)/%.dtsp FORCE $(obj)/%.dtb: $(src)/%.dtsp FORCE