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Date: Thu, 15 Sep 2016 17:41:14 +0100
From: Mark Rutland <mark.rutland@....com>
To: Catalin Marinas <catalin.marinas@....com>
Cc: Kees Cook <keescook@...omium.org>, kernel-hardening@...ts.openwall.com,
andre.przywara@....com, Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Will Deacon <will.deacon@....com>,
AKASHI Takahiro <takahiro.akashi@...aro.org>,
James Morse <james.morse@....com>, suzuki.poulose@....com,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 0/7] arm64: Privileged Access Never using TTBR0_EL1
switching
On Thu, Sep 15, 2016 at 05:20:45PM +0100, Mark Rutland wrote:
> Don't we need to fix up do_sysinstr() (which performs raw cache
> maintenance ops on __user addresses) with
> uaccess_{enable,disable}_not_uao()?
Actually, we don't even need to do anything in the case of PAN since
cache ops aren't affected by PAN/UAO; we just need to map/unmap in the
TTBR0-switching case to ensure we don't get stup fixing things up
forever.
/me commences name bikeshedding.
Thanks,
Mark.
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