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Message-ID: <20160929224452.GA71670@samitolvanen.mtv.corp.google.com>
Date: Thu, 29 Sep 2016 15:44:52 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: kernel-hardening@...ts.openwall.com
Cc: Catalin Marinas <catalin.marinas@....com>,
linux-arm-kernel@...ts.infradead.org,
Kees Cook <keescook@...omium.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Will Deacon <will.deacon@....com>,
AKASHI Takahiro <takahiro.akashi@...aro.org>,
James Morse <james.morse@....com>, andre.przywara@....com,
suzuki.poulose@....com
Subject: Re: 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:
> Likewise, how do we handle __flush_cache_user_range and
> flush_icache_range? Some callers (e.g. __do_compat_cache_op) pass in
> __user addresses.
Also EXEC_USERSPACE in lkdtm passes a user space address to flush_icache_range
and causes the process to hang when I tested these patches on HiKey.
Adding uaccess_{enable,disable}_not_uao to __flush_cache_user_range appears to
fix the problem.
Sami
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