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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@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Roberto Sassu 2021-05-14 17:27:50 +02:00 committed by Mimi Zohar
parent 1886ab01a3
commit 1434c6a1d3
1 changed files with 8 additions and 2 deletions
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Documentation/ABI/testing/evm
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@ -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.