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Message-ID: <20160909234048.GA9803@davidb.org>
Date: Fri, 9 Sep 2016 17:40:48 -0600
From: David Brown <david.brown@...aro.org>
To: kernel-hardening@...ts.openwall.com
Cc: linux-arm-kernel@...ts.infradead.org,
AKASHI Takahiro <takahiro.akashi@...aro.org>,
Will Deacon <will.deacon@....com>,
James Morse <james.morse@....com>,
Kees Cook <keescook@...omium.org>,
Julien Grall <julien.grall@....com>
Subject: Re: [PATCH v2 0/7] arm64: Privileged Access Never
using TTBR0_EL1 switching
On Fri, Sep 02, 2016 at 04:02:06PM +0100, Catalin Marinas wrote:
>This is the second version of the arm64 PAN emulation by disabling
>TTBR0_EL1 accesses. The major change from v1 is the use of a thread_info
>member to store the real TTBR0_EL1 value. The advantage is slightly
>simpler assembler macros for uaccess_enable with the downside that
>switch_mm() must always update the saved ttbr0 even if there is no mm
>switch.
I seem to have a lot better results with this series than I was having
with v1. I've tested this both within qemu, and on the HiKey board
and with OP-TEE (to make sure it didn't break anything), and
everything seems to be working.
Tested-by: David Brown <david.brown@...aro.org>
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