linux-kernel - Re: [PATCH] include/linux: avoid narrowing length parameter values

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Message-ID: <20150518155631.GX7232@ZenIV.linux.org.uk>
Date:	Mon, 18 May 2015 16:56:31 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Louis Langholtz <lou_langholtz@...com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] include/linux: avoid narrowing length parameter values

On Mon, May 18, 2015 at 09:33:10AM -0600, Louis Langholtz wrote:
> memcpy_from_msg() and memcpy_to_msg() functions previously called
> memcpy_fromiovec() and memcpy_toiovec() functions respectively. The
> memcpy_fromiovec() and memcpy_toiovec() functions took a length parameter
> of type int. memcpy_from_msg() and memcpy_to_msg() now call
> copy_from_iter() and copy_to_iter() functions respectively which take a length
> parameter of type size_t. Most code calling the memcpy_from_msg() and
> memcpy_to_msg() functions currently pass a length value of type size_t.
> This patch updates the memcpy_from_msg() and memcpy_to_msg() functions
> concordantly to take the length parameter of type size_t. This also avoids a potential
> for data narrowing.

iov_iter for sendmsg or recvmsg *can't* have more than 2Gb of data; if it
ever does, it's a serious bug.

IOW, NAK - that's pointless.
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