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

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Message-ID: <20090518093136.152a1bb7@lxorguk.ukuu.org.uk>
Date:	Mon, 18 May 2009 09:31:36 +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()

> System calls don't trigger SIGSEGVs so they can't rely on that when
> calling read().  I'm not sure how they handle that.

Usually by touching the pages before the syscall. (You can't rely on
-EFAULT either in POSIX, its optional that it bothers to tell you and for
example on MMUless it may well not)

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