linux-kernel - Minor PKRU bug?

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Message-ID: <CALCETrVUZAo2=ZK8EZxjHDGiUj=XU_d-=L9SSDYU+F75CZiLsA@mail.gmail.com>
Date:	Sat, 9 Jul 2016 14:27:06 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Dave Hansen <dave.hansen@...ux.intel.com>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Minor PKRU bug?

is_prefetch in arch/x86/mm/fault.c can be called on a user address
that's not readable due to PKRU.  This could break it.  You might need
to add a get_user_exec or similar.

--Andy