From: Eric Biggers <ebiggers@kernel.org>
To: Fan Wu <wufan@linux.microsoft.com>
Cc: corbet@lwn.net, zohar@linux.ibm.com, jmorris@namei.org,
serge@hallyn.com, tytso@mit.edu, axboe@kernel.dk, agk@redhat.com,
snitzer@kernel.org, eparis@redhat.com, paul@paul-moore.com,
linux-doc@vger.kernel.org, linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org, fsverity@lists.linux.dev,
linux-block@vger.kernel.org, dm-devel@lists.linux.dev,
audit@vger.kernel.org, linux-kernel@vger.kernel.org,
Deven Bowers <deven.desai@linux.microsoft.com>
Subject: Re: [PATCH v16 17/20] ipe: enable support for fs-verity as a trust provider
Date: Tue, 2 Apr 2024 22:10:31 -0700 [thread overview]
Message-ID: <20240403051031.GK2576@sol.localdomain> (raw)
In-Reply-To: <1711657047-10526-18-git-send-email-wufan@linux.microsoft.com>
On Thu, Mar 28, 2024 at 01:17:24PM -0700, Fan Wu wrote:
> Enable IPE policy authors to indicate trust for a singular fsverity
> file, identified by the digest information, through "fsverity_digest"
> and all files using fsverity's builtin signatures via
> "fsverity_signature".
Again, I'm pretty sure you actually care about all files with *valid* builtin
signatures, not simply all files with builtin signatures...
> +/**
> + * ipe_inode_setintegrity - save integrity data from a inode to IPE's LSM blob.
> + * @inode: The inode to source the security blob from.
> + * @type: Supplies the integrity type.
> + * @value: The value to be stored.
> + * @size: The size of @value.
> + *
> + * Saves fsverity signature into inode security blob
> + *
> + * Return:
> + * * 0 - OK
> + * * !0 - Error
> + */
> +int ipe_inode_setintegrity(struct inode *inode, enum lsm_integrity_type type,
> + const void *value, size_t size)
> +{
> + struct ipe_inode *inode_sec = ipe_inode(inode);
> +
> + if (type == LSM_INT_FSVERITY_BUILTINSIG) {
> + inode_sec->fs_verity_signed = size > 0 && value;
> + return 0;
> + }
> +
> + return 0;
This is the actual code, and it's *still* documented incorrectly. No, it
doesn't "Save fsverity signature into inode security blob". All it actually
does is save a flag saying that there was a valid signature.
The flag also should be called something like fsverity_sig_valid, indicating
that there is a builtin signature *and* it's valid.
- Eric
next prev parent reply other threads:[~2024-04-03 5:10 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-28 20:17 [PATCH v16 00/20] Integrity Policy Enforcement LSM (IPE) Fan Wu
2024-03-28 20:17 ` [PATCH v16 01/20] security: add ipe lsm Fan Wu
2024-03-28 20:45 ` Jarkko Sakkinen
2024-03-28 22:11 ` Randy Dunlap
2024-03-30 11:11 ` Jarkko Sakkinen
2024-03-28 20:17 ` [PATCH v16 02/20] ipe: add policy parser Fan Wu
2024-03-28 20:46 ` Jarkko Sakkinen
2024-03-28 20:47 ` Jarkko Sakkinen
2024-03-28 20:17 ` [PATCH v16 03/20] ipe: add evaluation loop Fan Wu
2024-03-28 20:49 ` Jarkko Sakkinen
2024-03-28 20:17 ` [PATCH v16 04/20] ipe: add LSM hooks on execution and kernel read Fan Wu
2024-03-28 20:17 ` [PATCH v16 05/20] initramfs|security: Add a security hook to do_populate_rootfs() Fan Wu
2024-03-28 20:17 ` [PATCH v16 06/20] ipe: introduce 'boot_verified' as a trust provider Fan Wu
2024-03-28 20:17 ` [PATCH v16 07/20] security: add new securityfs delete function Fan Wu
2024-03-28 20:17 ` [PATCH v16 08/20] ipe: add userspace interface Fan Wu
2024-03-28 20:17 ` [PATCH v16 09/20] uapi|audit|ipe: add ipe auditing support Fan Wu
2024-03-28 20:17 ` [PATCH v16 10/20] ipe: add permissive toggle Fan Wu
2024-03-28 20:17 ` [PATCH v16 11/20] block|security: add LSM blob to block_device Fan Wu
2024-03-30 11:26 ` kernel test robot
2024-04-02 1:26 ` Paul Moore
2024-03-28 20:17 ` [PATCH v16 12/20] dm: add finalize hook to target_type Fan Wu
2024-03-28 20:17 ` [PATCH v16 13/20] dm verity: consume root hash digest and signature data via LSM hook Fan Wu
2024-04-02 1:26 ` Paul Moore
2024-03-28 20:17 ` [PATCH v16 14/20] ipe: add support for dm-verity as a trust provider Fan Wu
2024-04-02 1:26 ` Paul Moore
2024-03-28 20:17 ` [PATCH v16 15/20] security: add security_inode_setintegrity() hook Fan Wu
2024-04-02 1:26 ` Paul Moore
2024-03-28 20:17 ` [PATCH v16 16/20] fsverity: consume fsverity built-in signatures via LSM hook Fan Wu
2024-04-03 5:02 ` Eric Biggers
2024-03-28 20:17 ` [PATCH v16 17/20] ipe: enable support for fs-verity as a trust provider Fan Wu
2024-04-03 5:10 ` Eric Biggers [this message]
2024-03-28 20:17 ` [PATCH v16 18/20] scripts: add boot policy generation program Fan Wu
2024-03-28 20:17 ` [PATCH v16 19/20] ipe: kunit test for parser Fan Wu
2024-03-28 20:17 ` [PATCH v16 20/20] documentation: add ipe documentation Fan Wu
2024-03-28 20:36 ` [PATCH v16 00/20] Integrity Policy Enforcement LSM (IPE) Jarkko Sakkinen
2024-03-28 20:38 ` Jarkko Sakkinen
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