linux-kernel - Re: [PATCH] fs: Drop CAP_SYS_RAWIO requirement for FIBMAP

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Message-ID: <20151209225222.GA31596@mail.hallyn.com>
Date:	Wed, 9 Dec 2015 16:52:22 -0600
From:	"Serge E. Hallyn" <serge.hallyn@...ntu.com>
To:	Seth Forshee <seth.forshee@...onical.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Theodore Ts'o <tytso@....edu>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs: Drop CAP_SYS_RAWIO requirement for FIBMAP

On Sat, Dec 05, 2015 at 12:15:16AM -0600, Seth Forshee wrote:
> The information exposed by FIBMAP is not privileged and is
> similar to the information provided by FIEMAP, which does not
> require privileges. According to [1] the reason the capability
> check was originally added was to prevent crashing the kernel
> by passing invalid arguments, but this should no longer be a
> problem, so this requirement can be removed.
> 
> [1] http://www.gossamer-threads.com/lists/linux/kernel/103611
> 
> Cc: "Serge E. Hallyn" <serge@...lyn.com>
> Cc: Theodore Ts'o <tytso@....edu>
> Signed-off-by: Seth Forshee <seth.forshee@...onical.com>

Acked-by: Serge Hallyn <serge.hallyn@...onical.com>

> ---
>  fs/ioctl.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/fs/ioctl.c b/fs/ioctl.c
> index 5d01d2638ca5..c963d82b0de8 100644
> --- a/fs/ioctl.c
> +++ b/fs/ioctl.c
> @@ -55,8 +55,6 @@ static int ioctl_fibmap(struct file *filp, int __user *p)
>  	/* do we support this mess? */
>  	if (!mapping->a_ops->bmap)
>  		return -EINVAL;
> -	if (!capable(CAP_SYS_RAWIO))
> -		return -EPERM;
>  	res = get_user(block, p);
>  	if (res)
>  		return res;
> -- 
> 1.9.1
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