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Date: Thu, 26 Mar 2020 21:02:00 +0530 From: Amit Daniel Kachhap <amit.kachhap@....com> To: linux-arm-kernel@...ts.infradead.org Cc: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Vincenzo Frascino <Vincenzo.Frascino@....com>, linux-kernel@...r.kernel.org, Amit Daniel Kachhap <amit.kachhap@....com> Subject: [PATCH 2/2] 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 3b446c7d27ddd06 ("arm64: Kconfig: verify binutils support for ARM64_PTR_AUTH") masks binutils version lesser then 2.34. Reported-by: kbuild test robot <lkp@...el.com> Suggested-by: Vincenzo Frascino <Vincenzo.Frascino@....com> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@....com> --- arch/arm64/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index e6712b6..73135da 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1503,7 +1503,7 @@ config ARM64_PTR_AUTH default y depends on !KVM || ARM64_VHE depends on (CC_HAS_SIGN_RETURN_ADDRESS || CC_HAS_BRANCH_PROT_PAC_RET) && AS_HAS_PAC - depends on CC_IS_GCC || (CC_IS_CLANG && AS_HAS_CFI_NEGATE_RA_STATE) + depends on (CC_IS_GCC && (GCC_VERSION < 90100 || LD_VERSION >= 233010000)) || (CC_IS_CLANG && AS_HAS_CFI_NEGATE_RA_STATE) depends on (!FUNCTION_GRAPH_TRACER || DYNAMIC_FTRACE_WITH_REGS) help Pointer authentication (part of the ARMv8.3 Extensions) provides -- 2.7.4
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