linux-kernel - Re: [patch] quota: info leak in quota

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Message-ID: <20131104131619.GA8566@quack.suse.cz>
Date:	Mon, 4 Nov 2013 14:16:19 +0100
From:	Jan Kara <jack@...e.cz>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] quota: info leak in quota_getquota()

On Fri 01-11-13 13:21:54, Dan Carpenter wrote:
> The if_dqblk struct has a 4 byte hole at the end of the struct so
> uninitialized stack information is leaked to user space.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
  Thanks. I've merged the patch into my tree.

							Honza
> 
> diff --git a/fs/quota/quota.c b/fs/quota/quota.c
> index dea86e8..2b363e2 100644
> --- a/fs/quota/quota.c
> +++ b/fs/quota/quota.c
> @@ -117,6 +117,7 @@ static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
>  
>  static void copy_to_if_dqblk(struct if_dqblk *dst, struct fs_disk_quota *src)
>  {
> +	memset(dst, 0, sizeof(*dst));
>  	dst->dqb_bhardlimit = src->d_blk_hardlimit;
>  	dst->dqb_bsoftlimit = src->d_blk_softlimit;
>  	dst->dqb_curspace = src->d_bcount;
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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