[PATCH v15 12/26] ima: Only accept AUDIT rules for non-init_ima_ns namespaces for now
From: Stefan Berger <stefanb@linux.ibm.com>
Date: 2023-02-06 14:04:27
Also in:
linux-integrity, lkml
Subsystem:
extended verification module (evm), integrity measurement architecture (ima), security subsystem, the rest · Maintainers:
Mimi Zohar, Roberto Sassu, Dmitry Kasatkin, Paul Moore, James Morris, "Serge E. Hallyn", Linus Torvalds
For non-init_ima_ns namespaces, only accept AUDIT rules for now. Reject all rules that require support for measuring, appraisal, and hashing. Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> Acked-by: Christian Brauner <brauner@kernel.org> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com> --- v9: - Jump to err_audit when unsupported rules are detected --- security/integrity/ima/ima_policy.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 19aca18db323..2a2c88f7d135 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c@@ -1912,6 +1912,17 @@ static int ima_parse_rule(struct ima_namespace *ns, result = -EINVAL; break; } + + /* IMA namespace only accepts AUDIT rules */ + if (ns != &init_ima_ns && result == 0) { + switch (entry->action) { + case MEASURE: + case APPRAISE: + case HASH: + result = -EINVAL; + goto err_audit; + } + } } if (!result && !ima_validate_rule(entry)) result = -EINVAL;
@@ -1933,6 +1944,7 @@ static int ima_parse_rule(struct ima_namespace *ns, "verity rules should include d-ngv2"); } +err_audit: audit_log_format(ab, "res=%d", !result); audit_log_end(ab); return result;
--
2.37.3