linux-kernel - Re: [RFC PATCH v13 17/20] ipe: enable support for fs-verity as a trust provider

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Date: Wed, 28 Feb 2024 20:46:25 -0800
From: Eric Biggers <ebiggers@...nel.org>
To: Fan Wu <wufan@...ux.microsoft.com>
Cc: corbet@....net, zohar@...ux.ibm.com, jmorris@...ei.org,
	serge@...lyn.com, tytso@....edu, axboe@...nel.dk, agk@...hat.com,
	snitzer@...nel.org, eparis@...hat.com, paul@...l-moore.com,
	linux-doc@...r.kernel.org, linux-integrity@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fscrypt@...r.kernel.org, linux-block@...r.kernel.org,
	dm-devel@...ts.linux.dev, audit@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Deven Bowers <deven.desai@...ux.microsoft.com>
Subject: Re: [RFC PATCH v13 17/20] ipe: enable support for fs-verity as a
 trust provider

On Wed, Feb 28, 2024 at 04:54:59PM -0800, Fan Wu wrote:
> diff --git a/security/ipe/hooks.c b/security/ipe/hooks.c
> index f5190a1347a6..ca1573ff21b7 100644
> --- a/security/ipe/hooks.c
> +++ b/security/ipe/hooks.c
> @@ -254,3 +254,33 @@ int ipe_bdev_setsecurity(struct block_device *bdev, const char *key,
>  	return -EOPNOTSUPP;
>  }
>  #endif /* CONFIG_IPE_PROP_DM_VERITY */
> +
> +#ifdef CONFIG_IPE_PROP_FS_VERITY
> +/**
> + * ipe_inode_setsecurity - Sets fields of a inode security blob from @key.
> + * @inode: The inode to source the security blob from.
> + * @name: The name representing the information to be stored.
> + * @value: The value to be stored.
> + * @size: The size of @value.
> + * @flags: unused
> + *
> + * Saves fsverity signature & digest into inode security blob
> + *
> + * Return:
> + * * 0	- OK
> + * * !0	- Error
> + */
> +int ipe_inode_setsecurity(struct inode *inode, const char *name,
> +			  const void *value, size_t size,
> +			  int flags)
> +{
> +	struct ipe_inode *inode_sec = ipe_inode(inode);
> +
> +	if (!strcmp(name, FS_VERITY_INODE_SEC_NAME)) {
> +		inode_sec->fs_verity_signed = size > 0 && value;
> +		return 0;
> +	}
> +
> +	return -EOPNOTSUPP;
> +}

So IPE is interested in whether a file has an fsverity builtin signature, but it
doesn't care what the signature is or whether it has been checked.  What is the
point?

- Eric