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From: David Sterba <dsterba@suse.cz>
To: "Luis R. Rodriguez" <mcgrof@kernel.org>
Cc: viro@zeniv.linux.org.uk, darrick.wong@oracle.com, tytso@mit.edu,
	adilger.kernel@dilger.ca, clm@fb.com, jbacik@fb.com,
	dsterba@suse.com, sandeen@sandeen.net, dhowells@redhat.com,
	fliu@suse.com, jack@suse.cz, jeffm@suse.com, nborisov@suse.com,
	jake.norris@suse.com, mtk.manpages@gmail.com,
	linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org,
	linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC v2 4/4] btrfs: verify symlinks with append/immutable flags
Date: Fri, 11 May 2018 16:04:51 +0200	[thread overview]
Message-ID: <20180511140451.GY6649@twin.jikos.cz> (raw)
In-Reply-To: <20180510231359.16899-5-mcgrof@kernel.org>

On Thu, May 10, 2018 at 04:13:59PM -0700, Luis R. Rodriguez wrote:
> The Linux VFS does not allow a way to set append/immuttable
                                                   ^^^^^^^^^^

Typo, in all 3 patches.

> attributes to symlinks, this is just not possible. If this is
> detected inform the user as the filesystem must be corrupted.
> 
> Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
> ---
>  fs/btrfs/inode.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index c4bdb597b323..d9c786be408c 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -3933,6 +3933,15 @@ static int btrfs_read_locked_inode(struct inode *inode)
>  		inode->i_op = &btrfs_dir_inode_operations;
>  		break;
>  	case S_IFLNK:
> +		/* VFS does not allow setting these so must be corruption */
> +		if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) {
> +			ret = -EUCLEAN;
> +			btrfs_crit(fs_info,
> +				  "corrupt symlink with append/immutable ino=%llu root=%llu\n",

no "\n" and please un-indent the string so it fits 80 columns.

> +				  btrfs_ino(BTRFS_I(inode)),
> +				  root->root_key.objectid);
> +			goto make_bad;

I found some error handling issues, before the switch, there's
btrfs_free_path and there's one more at the make_bad label.

To fix that, please set path = NULL after the first btrfs_free_path, it
can handle a NULL when it's called again.

Next thing I'm not sure about are the ACLs that get initialized in some
cases. There's cache_no_acl() that only resets the inode::i_acl and
inode::i_default_acl, so I think this should be called too. Thanks.

      reply	other threads:[~2018-05-11 14:07 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-10 23:13 [RFC v2 0/4] vfs: detect symlink corruption with attributes Luis R. Rodriguez
2018-05-10 23:13 ` [RFC v2 1/4] vfs: skip extra attributes check on removal for symlinks Luis R. Rodriguez
2018-05-10 23:13 ` [RFC v2 2/4] xfs: add verifier check for symlink with append/immutable flags Luis R. Rodriguez
2018-05-11  2:20   ` Darrick J. Wong
2018-05-10 23:13 ` [RFC v2 3/4] ext4: " Luis R. Rodriguez
2018-05-11 21:12   ` Jan Kara
2018-05-13 20:51     ` Theodore Y. Ts'o
2018-05-10 23:13 ` [RFC v2 4/4] btrfs: verify symlinks " Luis R. Rodriguez
2018-05-11 14:04   ` David Sterba [this message]

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