Re: [PATCH v6 5/5] fsverity: update the documentation

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On 3/18/22 14:21, Mimi Zohar wrote:
Update the fsverity documentation related to IMA signature support.

Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxx>
---
  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

The Integrity Measurement Architecture (IMA) supports including ...

+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

IMA supports the fs-verity hashing mechanism as an alternative to full file hashes for those who want the performance and security benefits ...

+    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

However, it doesn't make sense ...

+    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.

Fs-verity already meets many user' needs even as a standalone filesystem feature and it is testable like other ...

:Q: Isn't fs-verity useless because the attacker can just modify the
      hashes in the Merkle tree, which is stored on-disk?



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