linux-ext4 - Re: [PATCH v4 07/16] fs-verity: add the hook for file ->open()

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Date:   Sat, 15 Jun 2019 10:42:07 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-fscrypt@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-integrity@...r.kernel.org, Jaegeuk Kim <jaegeuk@...nel.org>,
        Victor Hsieh <victorhsieh@...gle.com>,
        Dave Chinner <david@...morbit.com>,
        Christoph Hellwig <hch@....de>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v4 07/16] fs-verity: add the hook for file ->open()

On Thu, Jun 06, 2019 at 08:51:56AM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> Add the fsverity_file_open() function, which prepares an fs-verity file
> to be read from.  If not already done, it loads the fs-verity descriptor
> from the filesystem and sets up an fsverity_info structure for the inode
> which describes the Merkle tree and contains the file measurement.  It
> also denies all attempts to open verity files for writing.
> 
> This commit also begins the include/linux/fsverity.h header, which
> declares the interface between fs/verity/ and filesystems.
> 
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>

Looks good; you can add:

Reviewed-off-by: Theodore Ts'o <tytso@....edu>

						- Ted

> +/*
> + * Validate the given fsverity_descriptor and create a new fsverity_info from
> + * it.  The signature (if present) is also checked.
> + */
> +struct fsverity_info *fsverity_create_info(const struct inode *inode,
> +					   const void *_desc, size_t desc_size)

Well, technically it's not checked (yet).  It doesn't get checked
until [PATCH 13/16]: support builtin file signatures.  If we want to
be really nit-picky, that portion of the comment could be moved to
later in the series.