From: catalin.marinas@arm.com (Catalin Marinas)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] arm: hwcap: add new hwcap for identifying PXN bits
Date: Fri, 24 Oct 2014 11:11:42 +0100 [thread overview]
Message-ID: <20141024101142.GA1955@localhost> (raw)
In-Reply-To: <1414144655-25204-1-git-send-email-js07.lee@gmail.com>
On Fri, Oct 24, 2014 at 10:57:34AM +0100, Jungseung Lee wrote:
> Modern ARMv7-A/R cores can optionally implement below new
> hardware feature:
>
> - PXN:
> Privileged execute-never(PXN) is a security feature. PXN bit
> determines whether the processor can execute software from
> the region. This is effective solution against ret2usr attack.
>
> This patch adds new HWCAP defines to describe new feature.
> On an implementation that does not include the LPAE, PXN is
> optionally supported.
Why does the user need to know about such feature? Just enable it in the
kernel if available.
--
Catalin
next prev parent reply other threads:[~2014-10-24 10:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-24 9:57 [PATCH 1/2] arm: hwcap: add new hwcap for identifying PXN bits Jungseung Lee
2014-10-24 9:57 ` [PATCH 2/2] arm: Support for the PXN CPU feature on ARMv7 Jungseung Lee
2014-10-24 10:10 ` [PATCH 1/2] arm: hwcap: add new hwcap for identifying PXN bits Russell King - ARM Linux
2014-10-24 10:11 ` Catalin Marinas [this message]
2014-10-24 10:32 ` Jungseung Lee
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