linux-ext4 - Re: [PATCH v5 03/16] fs-verity: add UAPI header

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Date:   Sat, 22 Jun 2019 15:11:36 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
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,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Victor Hsieh <victorhsieh@...gle.com>,
        Chandan Rajendra <chandan@...ux.vnet.ibm.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 v5 03/16] fs-verity: add UAPI header

On 06/20, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> Add the UAPI header for fs-verity, including two ioctls:
> 
> - FS_IOC_ENABLE_VERITY
> - FS_IOC_MEASURE_VERITY
> 
> These ioctls are documented in the "User API" section of
> Documentation/filesystems/fsverity.rst.
> 
> Examples of using these ioctls can be found in fsverity-utils
> (https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/fsverity-utils.git).
> 
> I've also written xfstests that test these ioctls
> (https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/xfstests-dev.git/log/?h=fsverity).
> 
> Reviewed-by: Theodore Ts'o <tytso@....edu>

Reviewed-by: Jaegeuk Kim <jaegeuk@...nel.org>

> Signed-off-by: Eric Biggers <ebiggers@...gle.com>
> ---
>  Documentation/ioctl/ioctl-number.txt |  1 +
>  include/uapi/linux/fsverity.h        | 39 ++++++++++++++++++++++++++++
>  2 files changed, 40 insertions(+)
>  create mode 100644 include/uapi/linux/fsverity.h
> 
> diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
> index c9558146ac5896..21767c81e86d58 100644
> --- a/Documentation/ioctl/ioctl-number.txt
> +++ b/Documentation/ioctl/ioctl-number.txt
> @@ -225,6 +225,7 @@ Code  Seq#(hex)	Include File		Comments
>  'f'	00-0F	fs/ext4/ext4.h		conflict!
>  'f'	00-0F	linux/fs.h		conflict!
>  'f'	00-0F	fs/ocfs2/ocfs2_fs.h	conflict!
> +'f'	81-8F	linux/fsverity.h
>  'g'	00-0F	linux/usb/gadgetfs.h
>  'g'	20-2F	linux/usb/g_printer.h
>  'h'	00-7F				conflict! Charon filesystem
> diff --git a/include/uapi/linux/fsverity.h b/include/uapi/linux/fsverity.h
> new file mode 100644
> index 00000000000000..57d1d7fc0c345a
> --- /dev/null
> +++ b/include/uapi/linux/fsverity.h
> @@ -0,0 +1,39 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +/*
> + * fs-verity user API
> + *
> + * These ioctls can be used on filesystems that support fs-verity.  See the
> + * "User API" section of Documentation/filesystems/fsverity.rst.
> + *
> + * Copyright 2019 Google LLC
> + */
> +#ifndef _UAPI_LINUX_FSVERITY_H
> +#define _UAPI_LINUX_FSVERITY_H
> +
> +#include <linux/ioctl.h>
> +#include <linux/types.h>
> +
> +#define FS_VERITY_HASH_ALG_SHA256	1
> +
> +struct fsverity_enable_arg {
> +	__u32 version;
> +	__u32 hash_algorithm;
> +	__u32 block_size;
> +	__u32 salt_size;
> +	__u64 salt_ptr;
> +	__u32 sig_size;
> +	__u32 __reserved1;
> +	__u64 sig_ptr;
> +	__u64 __reserved2[11];
> +};
> +
> +struct fsverity_digest {
> +	__u16 digest_algorithm;
> +	__u16 digest_size; /* input/output */
> +	__u8 digest[];
> +};
> +
> +#define FS_IOC_ENABLE_VERITY	_IOW('f', 133, struct fsverity_enable_arg)
> +#define FS_IOC_MEASURE_VERITY	_IOWR('f', 134, struct fsverity_digest)
> +
> +#endif /* _UAPI_LINUX_FSVERITY_H */
> -- 
> 2.22.0.410.gd8fdbe21b5-goog