linux-ext4 - Re: [v13 2/5] ext4: adds project ID support

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Message-Id: <60E980ED-C4CF-4558-B0A2-5E5671388BE1@dilger.ca>
Date:	Mon, 20 Apr 2015 17:25:51 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Li Xi <pkuelelixi@...il.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-api@...r.kernel.org, tytso@....edu, jack@...e.cz,
	viro@...iv.linux.org.uk, hch@...radead.org, dmonakhov@...nvz.org
Subject: Re: [v13 2/5] ext4: adds project ID support

On Apr 19, 2015, at 7:39 PM, Li Xi <pkuelelixi@...il.com> wrote:
> 
> This patch adds a new internal field of ext4 inode to save project
> identifier. Also a new flag EXT4_INODE_PROJINHERIT is added for
> inheriting project ID from parent directory.
> 

> @@ -3930,12 +3939,18 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
> 	inode->i_mode = le16_to_cpu(raw_inode->i_mode);
> 	i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low);
> 	i_gid = (gid_t)le16_to_cpu(raw_inode->i_gid_low);
> +	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_PROJECT))
> +		i_projid = (projid_t)le32_to_cpu(raw_inode->i_projid);

This needs to check if EXT4_PROJID_INHERIT_FL is set, and if i_projid
fits in i_extra_isize, otherwise it could be accessing a garbage value
beyond i_extra_isize.

Cheers, Andreas





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