This is a note to let you know that I've just added the patch titled
arm64: link with -z norelro for LLD or aarch64-elf
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-link-with-z-norelro-for-lld-or-aarch64-elf.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Fri Jun 25 12:15:34 PM CEST 2021
From: Jisheng Zhang <Jisheng.Zhang@xxxxxxxxxxxxx>
Date: Fri, 25 Jun 2021 15:50:12 +0800
Subject: arm64: link with -z norelro for LLD or aarch64-elf
To: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>, stable@xxxxxxxxxxxxxxx, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Nathan Chancellor <natechancellor@xxxxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>, Sami Tolvanen <samitolvanen@xxxxxxxxxx>, Masahiro Yamada <masahiroy@xxxxxxxxxx>, Sedat Dilek <sedat.dilek@xxxxxxxxx>, Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Cc: "Catalin Marinas" <catalin.marinas@xxxxxxx>, "Will Deacon" <will@xxxxxxxxxx>, "Alan Modra" <amodra@xxxxxxxxx>, "Fāng-ruì Sòng" <maskray@xxxxxxxxxx>, "Quentin Perret" <qperret@xxxxxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Message-ID: <20210625155012.4aec8450@xhacker.debian>
From: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
commit 311bea3cb9ee20ef150ca76fc60a592bf6b159f5 upstream.
With GNU binutils 2.35+, linking with BFD produces warnings for vmlinux:
aarch64-linux-gnu-ld: warning: -z norelro ignored
BFD can produce this warning when the target emulation mode does not
support RELRO program headers, and -z relro or -z norelro is passed.
Alan Modra clarifies:
The default linker emulation for an aarch64-linux ld.bfd is
-maarch64linux, the default for an aarch64-elf linker is
-maarch64elf. They are not equivalent. If you choose -maarch64elf
you get an emulation that doesn't support -z relro.
The ARCH=arm64 kernel prefers -maarch64elf, but may fall back to
-maarch64linux based on the toolchain configuration.
LLD will always create RELRO program header regardless of target
emulation.
To avoid the above warning when linking with BFD, pass -z norelro only
when linking with LLD or with -maarch64linux.
Fixes: 3b92fa7485eb ("arm64: link with -z norelro regardless of CONFIG_RELOCATABLE")
Fixes: 3bbd3db86470 ("arm64: relocatable: fix inconsistencies in linker script and options")
Cc: <stable@xxxxxxxxxxxxxxx> # 5.0.x-
Reported-by: kernelci.org bot <bot@xxxxxxxxxxxx>
Reported-by: Quentin Perret <qperret@xxxxxxxxxx>
Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Alan Modra <amodra@xxxxxxxxx>
Cc: Fāng-ruì Sòng <maskray@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20201218002432.788499-1-ndesaulniers@xxxxxxxxxx
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/Makefile | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -10,7 +10,7 @@
#
# Copyright (C) 1995-2001 by Russell King
-LDFLAGS_vmlinux :=--no-undefined -X -z norelro
+LDFLAGS_vmlinux :=--no-undefined -X
CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
GZFLAGS :=-9
@@ -82,17 +82,21 @@ CHECKFLAGS += -D__AARCH64EB__
AS += -EB
# Prefer the baremetal ELF build target, but not all toolchains include
# it so fall back to the standard linux version if needed.
-KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
+KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro)
UTS_MACHINE := aarch64_be
else
KBUILD_CPPFLAGS += -mlittle-endian
CHECKFLAGS += -D__AARCH64EL__
AS += -EL
# Same as above, prefer ELF but fall back to linux target if needed.
-KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux)
+KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro)
UTS_MACHINE := aarch64
endif
+ifeq ($(CONFIG_LD_IS_LLD), y)
+KBUILD_LDFLAGS += -z norelro
+endif
+
CHECKFLAGS += -D__aarch64__
ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
Patches currently in stable-queue which might be from Jisheng.Zhang@xxxxxxxxxxxxx are
queue-5.4/arm64-link-with-z-norelro-for-lld-or-aarch64-elf.patch
queue-5.4/kbuild-add-config_ld_is_lld.patch
