From 0f75b03c008eacb9818af3a56dc088e72a623d17 Mon Sep 17 00:00:00 2001 From: Marco Felsch Date: Wed, 9 Nov 2022 12:59:09 +0100 Subject: [PATCH] feat(build): add support for new binutils versions Users of GNU ld (BPF) from binutils 2.39+ will observe multiple instaces of a new warning when linking the bl*.elf in the form: ld.bfd: warning: stm32mp1_helper.o: missing .note.GNU-stack section implies executable stack ld.bfd: NOTE: This behaviour is deprecated and will be removed in a future version of the linker ld.bfd: warning: bl2.elf has a LOAD segment with RWX permissions ld.bfd: warning: bl32.elf has a LOAD segment with RWX permissions These new warnings are enbaled by default to secure elf binaries: - https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=ba951afb99912da01a6e8434126b8fac7aa75107 - https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=0d38576a34ec64a1b4500c9277a8e9d0f07e6774 Fix it in a similar way to what the Linux kernel does, see: https://lore.kernel.org/all/20220810222442.2296651-1-ndesaulniers@google.com/ Following the reasoning there, we set "-z noexecstack" for all linkers (although LLVM's LLD defaults to it) and optional add --no-warn-rwx-segments since this a ld.bfd related. Signed-off-by: Marco Felsch Signed-off-by: Robert Schwebel Change-Id: I9430f5fa5036ca88da46cd3b945754d62616b617 Signed-off-by: Heiko Thiery Upstream: https://github.com/ARM-software/arm-trusted-firmware/commit/1f49db5f25cdd4e43825c9bcc0575070b80f628c --- Makefile | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index 1ddb7b844..470956b19 100644 --- a/Makefile +++ b/Makefile @@ -416,6 +416,8 @@ endif GCC_V_OUTPUT := $(shell $(CC) -v 2>&1) +TF_LDFLAGS += -z noexecstack + # LD = armlink ifneq ($(findstring armlink,$(notdir $(LD))),) TF_LDFLAGS += --diag_error=warning --lto_level=O1 @@ -442,7 +444,10 @@ TF_LDFLAGS += $(subst --,-Xlinker --,$(TF_LDFLAGS_$(ARCH))) # LD = gcc-ld (ld) or llvm-ld (ld.lld) or other else -TF_LDFLAGS += --fatal-warnings -O1 +# With ld.bfd version 2.39 and newer new warnings are added. Skip those since we +# are not loaded by a elf loader. +TF_LDFLAGS += $(call ld_option, --no-warn-rwx-segments) +TF_LDFLAGS += -O1 TF_LDFLAGS += --gc-sections # ld.lld doesn't recognize the errata flags, # therefore don't add those in that case -- 2.30.2