linux-kernel - Re: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable

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Message-ID: <20090518101614.GM16682@one.firstfloor.org>
Date:	Mon, 18 May 2009 12:16:14 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Jamie Lokier <jamie@...reable.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andi Kleen <andi@...stfloor.org>,
	Vitaly Mayatskikh <v.mayatskih@...il.com>,
	Josef Bacik <josef@...hat.com>, sandeen@...hat.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable_bytes()

> Is EFAULT really optional on systems with page protection?

It's de facto -- e.g. the x86-64 vsyscalls (getimeofday, time, clock_gettime,
getcpu) never implement it.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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