linux-kernel - Re: [patch] fcntl: return -EFAULT if copy_to

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Message-ID: <20100603124544.GX31073@ZenIV.linux.org.uk>
Date:	Thu, 3 Jun 2010 13:45:44 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
Cc:	Dan Carpenter <error27@...il.com>, Matthew Wilcox <matthew@....cx>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch] fcntl: return -EFAULT if copy_to_user fails

On Thu, Jun 03, 2010 at 07:22:34PM +0900, Takuya Yoshikawa wrote:
> (2010/06/03 19:04), Dan Carpenter wrote:
> >copy_to_user() returns the number of bytes remaining, but we want to
> >return -EFAULT.
> >
> >	ret = fcntl(fd, F_SETOWN_EX, NULL);
> >
> >With the original code ret would be 8 here.
> >
> >Signed-off-by: Dan Carpenter<error27@...il.com>
> 
> How about f_getown_ex() ?
> 
> 	if (!ret)
> 		ret = copy_to_user(owner_p, &owner, sizeof(owner));
> 	return ret;
> 
> Fixing this too would be better, I think.
> 
>   Takuya

Applied, will push today.
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