linux-kernel - Re: [PATCH] ceph: prevent snapshots to be created in encrypted locked directories

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Date:   Mon, 18 Apr 2022 09:17:14 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     Luís Henriques <lhenriques@...e.de>,
        Xiubo Li <xiubli@...hat.com>, Ilya Dryomov <idryomov@...il.com>
Cc:     ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ceph: prevent snapshots to be created in encrypted
 locked directories

On Mon, 2022-04-18 at 14:08 +0100, Luís Henriques wrote:
> With snapshot names encryption we can not allow snapshots to be created in
> locked directories because the names wouldn't be encrypted.  This patch
> forces the directory to be unlocked to allow a snapshot to be created.
> 
> Signed-off-by: Luís Henriques <lhenriques@...e.de>
> ---
>  fs/ceph/dir.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
> index f48f1ff20927..93e2f08102a1 100644
> --- a/fs/ceph/dir.c
> +++ b/fs/ceph/dir.c
> @@ -1071,6 +1071,10 @@ static int ceph_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
>  		err = -EDQUOT;
>  		goto out;
>  	}
> +	if ((op == CEPH_MDS_OP_MKSNAP) && !fscrypt_has_encryption_key(dir)) {
> +		err = -ENOKEY;
> +		goto out;
> +	}
>  
>  
>  	req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);

Looks good. I'll pull this and the v4 series into the wip-fscrypt later
todat.  
-- 
Jeff Layton <jlayton@...nel.org>