AuxXxilium/linux_dsm_epyc7002
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15cd0e675f
linux_dsm_epyc7002/arch/arm64
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Amit Daniel Kachhap 15cd0e675f arm64: Kconfig: ptrauth: Add binutils version check to fix mismatch 
Recent addition of ARM64_PTR_AUTH exposed a mismatch issue with binutils.
9.1+ versions of gcc inserts a section note .note.gnu.property but this
can be used properly by binutils version greater than 2.33.1. If older
binutils are used then the following warnings are generated,

aarch64-linux-ld: warning: arch/arm64/kernel/vdso/vgettimeofday.o: unsupported GNU_PROPERTY_TYPE (5) type: 0xc0000000
aarch64-linux-objdump: warning: arch/arm64/lib/csum.o: unsupported GNU_PROPERTY_TYPE (5) type: 0xc0000000
aarch64-linux-nm: warning: .tmp_vmlinux1: unsupported GNU_PROPERTY_TYPE (5) type: 0xc0000000

This patch enables ARM64_PTR_AUTH when gcc and binutils versions are
compatible with each other. Older gcc which do not insert such section
continue to work as before.

This scenario may not occur with clang as a recent commit 3b446c7d27
("arm64: Kconfig: verify binutils support for ARM64_PTR_AUTH") masks
binutils version lesser then 2.34.

Reported-by: kbuild test robot <lkp@intel.com>
Suggested-by: Vincenzo Frascino <Vincenzo.Frascino@arm.com>
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
[catalin.marinas@arm.com: slight adjustment to the comment]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2020-04-01 13:26:58 +01:00
..
boot ARMv8 Juno/Fast Models fix for v5.6 2020-02-11 14:47:09 -08:00
configs This pull request contains ARM64 defconfig changes for v5.6, please pull 2020-02-11 14:49:38 -08:00
crypto arm64: crypto: Modernize names for AES function macros 2020-03-09 17:35:04 +00:00
include Merge branch 'for-next/kernel-ptrauth' into for-next/core 2020-03-25 11:11:08 +00:00
kernel Merge branch 'for-next/kernel-ptrauth' into for-next/core 2020-03-25 11:11:08 +00:00
kvm Merge branch 'for-next/asm-cleanups' into for-next/core 2020-03-25 11:10:51 +00:00
lib arm64: fix spelling mistake "ca not" -> "cannot" 2020-03-17 18:22:40 +00:00
mm Merge branch 'for-next/kernel-ptrauth' into for-next/core 2020-03-25 11:11:08 +00:00
net arm64: bpf: optimize modulo operation 2019-09-03 15:44:40 +02:00
xen arm64: xen: Use modern annotations for assembly functions 2020-01-09 16:09:42 +00:00
Kbuild arm64: add arch/arm64/Kbuild 2019-08-21 18:47:15 +01:00
Kconfig arm64: Kconfig: ptrauth: Add binutils version check to fix mismatch 2020-04-01 13:26:58 +01:00
Kconfig.debug arm64: mm: convert mm/dump.c to use walk_page_range() 2020-02-04 03:05:25 +00:00
Kconfig.platforms i.MX SoC update for 5.5: 2019-11-06 07:46:42 -08:00
Makefile arm64: compile the kernel with ptrauth return address signing 2020-03-18 09:50:21 +00:00