linux-kernel - [PATCH v7 09/12] evm: Deprecate EVM_ALLOW_METADATA

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Date:   Fri, 14 May 2021 17:27:50 +0200
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     <zohar@...ux.ibm.com>, <mjg59@...f.ucam.org>
CC:     <linux-integrity@...r.kernel.org>,
        <linux-security-module@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: [PATCH v7 09/12] evm: Deprecate EVM_ALLOW_METADATA_WRITES

This patch deprecates the usage of EVM_ALLOW_METADATA_WRITES, as it is no
longer necessary. All the issues that prevent the usage of EVM portable
signatures just with a public key loaded have been solved.

This flag will remain available for a short time to ensure that users are
able to use EVM without it.

Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
---
 Documentation/ABI/testing/evm | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Documentation/ABI/testing/evm b/Documentation/ABI/testing/evm
index 2243b72e4110..553fd8a33e56 100644
--- a/Documentation/ABI/testing/evm
+++ b/Documentation/ABI/testing/evm
@@ -24,7 +24,7 @@ Description:
 		1	  Enable digital signature validation
 		2	  Permit modification of EVM-protected metadata at
 			  runtime. Not supported if HMAC validation and
-			  creation is enabled.
+			  creation is enabled (deprecated).
 		31	  Disable further runtime modification of EVM policy
 		===	  ==================================================
 
@@ -47,7 +47,13 @@ Description:
 
 		will enable digital signature validation, permit
 		modification of EVM-protected metadata and
-		disable all further modification of policy
+		disable all further modification of policy. This option is now
+		deprecated in favor of::
+
+		  echo 0x80000002 ><securityfs>/evm
+
+		as the outstanding issues that prevent the usage of EVM portable
+		signatures have been solved.
 
 		Echoing a value is additive, the new value is added to the
 		existing initialization flags.
-- 
2.25.1