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From: Catalin Marinas <catalin.marinas@arm.com>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: mark.rutland@arm.com, keescook@chromium.org,
	suzuki.poulose@arm.com, kristina.martsenko@arm.com,
	ardb@kernel.org, yamada.masahiro@socionext.com,
	broonie@kernel.org, james.morse@arm.com,
	clang-built-linux@googlegroups.com, ramana.radhakrishnan@arm.com,
	amit.kachhap@arm.com, vincenzo.frascino@arm.com, will@kernel.org,
	Dave.Martin@arm.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] arm64: Kconfig: verify binutils support for ARM64_PTR_AUTH
Date: Fri, 20 Mar 2020 15:09:52 +0000	[thread overview]
Message-ID: <20200320150952.GD29214@mbp> (raw)
In-Reply-To: <20200319181951.102662-1-ndesaulniers@google.com>

On Thu, Mar 19, 2020 at 11:19:51AM -0700, Nick Desaulniers wrote:
> Clang relies on GNU as from binutils to assemble the Linux kernel,
> currently. A recent patch to enable the armv8.3-a extension for pointer
> authentication checked for compiler support of the relevant flags.
> Everything works with binutils 2.34+, but for older versions we observe
> assembler errors:
> 
> /tmp/vgettimeofday-36a54b.s: Assembler messages:
> /tmp/vgettimeofday-36a54b.s:40: Error: unknown pseudo-op: `.cfi_negate_ra_state'
> 
> When compiling with Clang, require the assembler to support
> .cfi_negate_ra_state directives, in order to support CONFIG_ARM64_PTR_AUTH.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/938
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>

Queued. Thanks.

-- 
Catalin

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  parent reply	other threads:[~2020-03-20 15:10 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-13  9:04 [PATCH v7 00/17] arm64: return address signing Amit Daniel Kachhap
2020-03-13  9:04 ` [PATCH v7 01/17] arm64: cpufeature: Fix meta-capability cpufeature check Amit Daniel Kachhap
2020-03-13  9:04 ` [PATCH v7 02/17] arm64: cpufeature: add pointer auth meta-capabilities Amit Daniel Kachhap
2020-03-13  9:04 ` [PATCH v7 03/17] arm64: rename ptrauth key structures to be user-specific Amit Daniel Kachhap
2020-03-13  9:04 ` [PATCH v7 04/17] arm64: install user ptrauth keys at kernel exit time Amit Daniel Kachhap
2020-03-13  9:04 ` [PATCH v7 05/17] arm64: ptrauth: Add bootup/runtime flags for __cpu_setup Amit Daniel Kachhap
2020-03-13  9:04 ` [PATCH v7 06/17] arm64: cpufeature: Move cpu capability helpers inside C file Amit Daniel Kachhap
2020-03-13  9:04 ` [PATCH v7 07/17] arm64: cpufeature: handle conflicts based on capability Amit Daniel Kachhap
2020-03-13  9:04 ` [PATCH v7 08/17] arm64: enable ptrauth earlier Amit Daniel Kachhap
2020-03-13  9:04 ` [PATCH v7 09/17] arm64: initialize and switch ptrauth kernel keys Amit Daniel Kachhap
2020-03-13  9:04 ` [PATCH v7 10/17] arm64: initialize ptrauth keys for kernel booting task Amit Daniel Kachhap
2020-03-13  9:04 ` [PATCH v7 11/17] arm64: mask PAC bits of __builtin_return_address Amit Daniel Kachhap
2020-03-13  9:04 ` [PATCH v7 12/17] arm64: unwind: strip PAC from kernel addresses Amit Daniel Kachhap
2020-03-13  9:05 ` [PATCH v7 13/17] arm64: __show_regs: strip PAC from lr in printk Amit Daniel Kachhap
2020-03-13  9:05 ` [PATCH v7 14/17] arm64: suspend: restore the kernel ptrauth keys Amit Daniel Kachhap
2020-03-13  9:05 ` [PATCH v7 15/17] kconfig: Add support for 'as-option' Amit Daniel Kachhap
2020-03-13  9:05   ` Amit Daniel Kachhap
2020-03-13  9:10   ` Masahiro Yamada
2020-03-13  9:10     ` Masahiro Yamada
2020-03-13  9:14     ` Amit Kachhap
2020-03-13  9:14       ` Amit Kachhap
2020-03-13  9:05 ` [PATCH v7 16/17] arm64: compile the kernel with ptrauth return address signing Amit Daniel Kachhap
2020-03-19 18:19   ` [PATCH] arm64: Kconfig: verify binutils support for ARM64_PTR_AUTH Nick Desaulniers
2020-03-19 18:35     ` Nathan Chancellor
2020-03-20 15:09     ` Catalin Marinas [this message]
2020-03-13  9:05 ` [PATCH v7 17/17] lkdtm: arm64: test kernel pointer authentication Amit Daniel Kachhap
2020-03-18 14:32 ` [PATCH v7 00/17] arm64: return address signing Catalin Marinas

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