Messages in this thread | | | Date | Fri, 18 Mar 2022 16:55:01 -0400 | Subject | Re: [PATCH v6 5/5] fsverity: update the documentation | From | Stefan Berger <> |
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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@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
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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