Check if there are simultaneously writable and executable
program segments in vmlinux ELF image and fail build if there are any.
This would prevent accidental introduction of RWX segments.
Tested-by: Mario Limonciello <[email protected]>
Signed-off-by: Evgeniy Baskov <[email protected]>
---
arch/x86/boot/compressed/Makefile | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index 3a261abb6d15..64de6c2b1740 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -112,11 +112,17 @@ vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o
vmlinux-objs-$(CONFIG_EFI) += $(obj)/efi.o
efi-obj-$(CONFIG_EFI_STUB) = $(objtree)/drivers/firmware/efi/libstub/lib.a
+quiet_cmd_wx_check = WXCHK $<
+cmd_wx_check = if $(OBJDUMP) -p $< | grep "flags .wx" > /dev/null; \
+ then (echo >&2 "$<: Simultaneously writable and executable sections are prohibited"; \
+ /bin/false); fi
+
$(obj)/vmlinux: $(vmlinux-objs-y) $(efi-obj-y) FORCE
$(call if_changed,ld)
OBJCOPYFLAGS_vmlinux.bin := -R .comment -S
$(obj)/vmlinux.bin: vmlinux FORCE
+ $(call cmd,wx_check)
$(call if_changed,objcopy)
targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs
--
2.37.4