linux-kernel - Re: [PATCH 1/1] fanotify: for FAN_MARK

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Message-ID: <20140424100300.GL17824@quack.suse.cz>
Date:	Thu, 24 Apr 2014 12:03:00 +0200
From:	Jan Kara <jack@...e.cz>
To:	Heinrich Schuchardt <xypron.glpk@....de>
Cc:	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
	Jan Kara <jack@...e.cz>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH 1/1] fanotify: for FAN_MARK_FLUSH check flags

On Wed 23-04-14 23:55:51, Heinrich Schuchardt wrote:
> If fanotify_mark is called with illegal value of arguments flags and marks
> it usually returns EINVAL.
> 
> When fanotify_mark is called with FAN_MARK_FLUSH the argument flags is not
> checked for irrelevant flags like FAN_MARK_IGNORED_MASK.
> 
> The patch removes this inconsistency.
> 
> If an irrelevant flag is set error EINVAL is returned.
  OK, as Michael I think this shouldn't cause real userspace breakage and
it's better to have the flags checked. So feel free to add:
Acked-by: Jan Kara <jack@...e.cz>

							Honza

> 
> Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
> ---
>  fs/notify/fanotify/fanotify_user.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
> index 287a22c..8bba549 100644
> --- a/fs/notify/fanotify/fanotify_user.c
> +++ b/fs/notify/fanotify/fanotify_user.c
> @@ -819,7 +819,10 @@ SYSCALL_DEFINE5(fanotify_mark, int, fanotify_fd, unsigned int, flags,
>  	case FAN_MARK_REMOVE:
>  		if (!mask)
>  			return -EINVAL;
> +		break;
>  	case FAN_MARK_FLUSH:
> +		if (flags & ~(FAN_MARK_MOUNT | FAN_MARK_FLUSH))
> +			return -EINVAL;
>  		break;
>  	default:
>  		return -EINVAL;
> -- 
> 1.9.2
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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