linux-kernel - Re: [PATCH v3 03/10] evm: Implement per signature type decision in security_inode_copy_up

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Message-ID: <45f3d3c56a140d174e8234198124c1d2e1712f64.camel@linux.ibm.com>
Date: Tue, 19 Mar 2024 18:51:16 -0400
From: Mimi Zohar <zohar@...ux.ibm.com>
To: Stefan Berger <stefanb@...ux.ibm.com>, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-unionfs@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, paul@...l-moore.com, jmorris@...ei.org,
        serge@...lyn.com, roberto.sassu@...wei.com, amir73il@...il.com,
        brauner@...nel.org, miklos@...redi.hu
Subject: Re: [PATCH v3 03/10] evm: Implement per signature type decision in
 security_inode_copy_up_xattr

On Fri, 2024-02-23 at 12:25 -0500, Stefan Berger wrote:
> To support "portable and immutable signatures" on otherwise unsupported
> filesystems, determine the EVM signature type by the content of a file's
> xattr. If the file has the appropriate signature type then allow it to be
> copied up. All other signature types are discarded as before.
> 
> "Portable and immutable" EVM signatures can be copied up by stacked file-
> system since the metadata their signature covers does not include file-
> system-specific data such as a file's inode number, generation, and UUID.
> 
> Co-developed-by: Mimi Zohar <zohar@...ux.ibm.com>
> Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>

Signed-off-by: Mimi Zohar <zohar@...ux.ibm.com>