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

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Message-ID: <20090518110359.0da1e6a7@lxorguk.ukuu.org.uk>
Date:	Mon, 18 May 2009 11:03:59 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jamie Lokier <jamie@...reable.org>
Cc:	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()

> On MMUless you wouldn't use page protection as a GC technique :-)
> Is EFAULT really optional on systems with page protection?

Yes.

It's also not guaranteed under Linux although pretty much all our I/O
paths do bother to report -EFAULT

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