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Nick Desaulniers 0855fe6d88 arm64: link with -z norelro for LLD or aarch64-elf 
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: 3b92fa7485 ("arm64: link with -z norelro regardless of CONFIG_RELOCATABLE")
Fixes: 3bbd3db864 ("arm64: relocatable: fix inconsistencies in linker script and options")
Cc: <stable@vger.kernel.org> # 5.0.x-
Reported-by: kernelci.org bot <bot@kernelci.org>
Reported-by: Quentin Perret <qperret@google.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Alan Modra <amodra@gmail.com>
Cc: Fāng-ruì Sòng <maskray@google.com>
Link: https://lore.kernel.org/r/20201218002432.788499-1-ndesaulniers@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2021-06-30 08:47:44 -04:00
..
boot arm64: dts: zii-ultra: fix 12V_MAIN voltage 2021-06-10 13:37:07 +02:00
configs arm64/ARM: configs: Change CONFIG_REMOTEPROC from m to y 2019-09-30 11:48:00 -07:00
crypto crypto: arm64/sha - add missing module aliases 2021-03-04 10:26:44 +01:00
include KVM: arm64: Initialize VCPU mdcr_el2 before loading it 2021-05-22 11:38:30 +02:00
kernel arm64/vdso: Discard .note.gnu.property sections in vDSO 2021-05-11 14:04:14 +02:00
kvm KVM: arm64: Fix debug register indexing 2021-06-10 13:37:15 +02:00
lib arm64: Change .weak to SYM_FUNC_START_WEAK_PI for arch/arm64/lib/mem*.S 2020-11-10 12:37:24 +01:00
mm arm64: mm: use a 48-bit ID map when possible on 52-bit VA builds 2021-03-17 17:03:56 +01:00
net arm64: bpf: Fix branch offset in JIT 2020-09-23 12:40:42 +02:00
xen xen/efi: have a common runtime setup function 2019-10-02 10:31:07 -04:00
Kbuild arm64: add arch/arm64/Kbuild 2019-08-21 18:47:15 +01:00
Kconfig arm64: Extend workaround for erratum 1024718 to all versions of Cortex-A55 2021-03-04 10:26:49 +01:00
Kconfig.debug
…
Kconfig.platforms arm64: berlin: Select DW_APB_TIMER_OF 2020-11-05 11:43:36 +01:00
Makefile arm64: link with -z norelro for LLD or aarch64-elf 2021-06-30 08:47:44 -04:00