From: Mimi Zohar <zohar@linux.ibm.com>
To: linux-integrity@vger.kernel.org
Cc: Mimi Zohar <zohar@linux.ibm.com>,
Eric Biggers <ebiggers@kernel.org>,
Stefan Berger <stefanb@linux.ibm.com>,
linux-fscrypt@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v5 8/8] fsverity: update the documentation
Date: Fri, 11 Feb 2022 16:43:10 -0500 [thread overview]
Message-ID: <20220211214310.119257-9-zohar@linux.ibm.com> (raw)
In-Reply-To: <20220211214310.119257-1-zohar@linux.ibm.com>
Update the fsverity documentation related to IMA signature support.
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
---
Documentation/filesystems/fsverity.rst | 22 +++++++++++++---------
1 file changed, 13 insertions(+), 9 deletions(-)
diff --git a/Documentation/filesystems/fsverity.rst b/Documentation/filesystems/fsverity.rst
index 1d831e3cbcb3..28a47488848e 100644
--- a/Documentation/filesystems/fsverity.rst
+++ b/Documentation/filesystems/fsverity.rst
@@ -74,8 +74,12 @@ authenticating the files is up to userspace. However, to meet some
users' needs, fs-verity optionally supports a simple signature
verification mechanism where users can configure the kernel to require
that all fs-verity files be signed by a key loaded into a keyring; see
-`Built-in signature verification`_. Support for fs-verity file hashes
-in IMA (Integrity Measurement Architecture) policies is also planned.
+`Built-in signature verification`_.
+
+IMA supports including fs-verity file digests and signatures in the
+IMA (Integrity Measurement Architecture) measurement list and
+verifying fs-verity based file signatures stored as security.ima
+xattrs, based on policy.
User API
========
@@ -653,13 +657,13 @@ weren't already directly answered in other parts of this document.
hashed and what to do with those hashes, such as log them,
authenticate them, or add them to a measurement list.
- IMA is planned to support the fs-verity hashing mechanism as an
- alternative to doing full file hashes, for people who want the
- performance and security benefits of the Merkle tree based hash.
- But it doesn't make sense to force all uses of fs-verity to be
- through IMA. As a standalone filesystem feature, fs-verity
- already meets many users' needs, and it's testable like other
- filesystem features e.g. with xfstests.
+ IMA supports the fs-verity hashing mechanism as an alternative
+ to doing full file hashes, for people who want the performance
+ and security benefits of the Merkle tree based hash. But it
+ doesn't make sense to force all uses of fs-verity to be through
+ IMA. As a standalone filesystem feature, fs-verity already meets
+ many users' needs, and it's testable like other filesystem
+ features e.g. with xfstests.
:Q: Isn't fs-verity useless because the attacker can just modify the
hashes in the Merkle tree, which is stored on-disk?
--
2.27.0
prev parent reply other threads:[~2022-02-11 21:43 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-11 21:43 [PATCH v5 0/8] ima: support fs-verity digests and signatures Mimi Zohar
2022-02-11 21:43 ` [PATCH v5 1/8] ima: rename IMA_ACTION_FLAGS to IMA_NONACTION_FLAGS Mimi Zohar
2022-02-14 20:03 ` Stefan Berger
2022-02-15 18:11 ` Mimi Zohar
2022-02-11 21:43 ` [PATCH v5 2/8] ima: define ima_max_digest_data struct without a flexible array variable Mimi Zohar
2022-02-14 20:13 ` Stefan Berger
2022-02-11 21:43 ` [PATCH v5 3/8] fs-verity: define a function to return the integrity protected file digest Mimi Zohar
2022-02-23 23:59 ` Eric Biggers
2022-02-24 1:21 ` Mimi Zohar
2022-02-24 1:26 ` Eric Biggers
2022-02-24 1:27 ` Mimi Zohar
2022-02-11 21:43 ` [PATCH v5 4/8] ima: define a new template field 'd-type' and a new template 'ima-ngv2' Mimi Zohar
2022-02-14 20:38 ` Stefan Berger
2022-02-24 0:32 ` Eric Biggers
2022-02-24 16:16 ` Mimi Zohar
2022-02-24 18:46 ` Eric Biggers
2022-02-25 20:01 ` Mimi Zohar
2022-02-11 21:43 ` [PATCH v5 5/8] ima: permit fsverity's file digests in the IMA measurement list Mimi Zohar
2022-02-24 0:40 ` Eric Biggers
2022-03-17 15:58 ` Mimi Zohar
2022-02-11 21:43 ` [PATCH v5 6/8] ima: define signature version 3 Mimi Zohar
2022-02-24 0:50 ` Eric Biggers
2022-02-11 21:43 ` [PATCH v5 7/8] ima: support fs-verity file digest based version 3 signatures Mimi Zohar
2022-02-24 1:24 ` Eric Biggers
2022-03-17 15:46 ` Mimi Zohar
2022-02-11 21:43 ` Mimi Zohar [this message]
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