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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