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

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Date:	Thu, 03 Jun 2010 19:22:34 +0900
From:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
To:	Dan Carpenter <error27@...il.com>, Matthew Wilcox <matthew@....cx>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	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

(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

>
> diff --git a/fs/fcntl.c b/fs/fcntl.c
> index f74d270..0ea7b0f 100644
> --- a/fs/fcntl.c
> +++ b/fs/fcntl.c
> @@ -274,7 +274,7 @@ static int f_setown_ex(struct file *filp, unsigned long arg)
>
>   	ret = copy_from_user(&owner, owner_p, sizeof(owner));
>   	if (ret)
> -		return ret;
> +		return -EFAULT;
>
>   	switch (owner.type) {
>   	case F_OWNER_TID:
> --
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