linux-kernel - Re: [PATCH 07/11] arm64: add basic pointer authentication support

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Message-ID: <5a919df5-7f6d-2c6c-9c8e-e28fcebd4920@arm.com>
Date:   Fri, 11 Aug 2017 08:46:28 +0100
From:   Yao Qi <yao.qi@....com>
To:     Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     arnd@...db.de, catalin.marinas@....com,
        christoffer.dall@...aro.org, Dave.Martin@....com,
        jiong.wang@....com, kvmarm@...ts.cs.columbia.edu,
        linux-arch@...r.kernel.org, marc.zyngier@....com,
        suzuki.poulose@....com, will.deacon@....com,
        linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH 07/11] arm64: add basic pointer authentication support

Hi Mark,

On 19/07/17 17:01, Mark Rutland wrote:
> +#define HWCAP_APIA           (1 << 16)

Can you rename it to HWCAP_ARM64_APIA or HWCAP_ARM_APIA?  When we
use it in user space, at least in GDB, we usually do this,

#ifndef HWCAP_APIA
#define HWCAP_APIA (1 << 16)
#endif

However, the code use this macro can be compiled on !arm64 host.
If HWCAP_APIA is defined on other !arm64 host and its value is not
(1 << 16), the program "aarch64_hwcap & HWCAP_APIA ? XXX : XXX;" is
wrong, and compiler doesn't complain.

I notice that mips, mn10300, sparc, and s390 define their HWCAP this
way, like HWCAP_SPARC_FLUSH, HWCAP_MIPS_R6, HWCAP_S390_DFP, etc.
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