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- From 0f75b03c008eacb9818af3a56dc088e72a623d17 Mon Sep 17 00:00:00 2001
- From: Marco Felsch <m.felsch@pengutronix.de>
- 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 <m.felsch@pengutronix.de>
- Signed-off-by: Robert Schwebel <r.schwebel@pengutronix.de>
- Change-Id: I9430f5fa5036ca88da46cd3b945754d62616b617
- Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
- 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
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