linux-kernel - [PATCH v2 7/7] ima: Reset IMA_NONACTION_RULE_FLAGS after post

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Message-ID: <20241128100621.461743-8-roberto.sassu@huaweicloud.com>
Date: Thu, 28 Nov 2024 11:06:20 +0100
From: Roberto Sassu <roberto.sassu@...weicloud.com>
To: viro@...iv.linux.org.uk,
	brauner@...nel.org,
	jack@...e.cz,
	zohar@...ux.ibm.com,
	dmitry.kasatkin@...il.com,
	eric.snowberg@...cle.com,
	paul@...l-moore.com,
	jmorris@...ei.org,
	serge@...lyn.com
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-integrity@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Roberto Sassu <roberto.sassu@...wei.com>,
	stable@...r.kernel.org
Subject: [PATCH v2 7/7] ima: Reset IMA_NONACTION_RULE_FLAGS after post_setattr

From: Roberto Sassu <roberto.sassu@...wei.com>

Commit 11c60f23ed13 ("integrity: Remove unused macro
IMA_ACTION_RULE_FLAGS") removed the IMA_ACTION_RULE_FLAGS mask, due to it
not being used after commit 0d73a55208e9 ("ima: re-introduce own integrity
cache lock").

However, it seems that the latter commit mistakenly used the wrong mask
when moving the code from ima_inode_post_setattr() to
process_measurement(). There is no mention in the commit message about this
change and it looks quite important, since changing from IMA_ACTIONS_FLAGS
(later renamed to IMA_NONACTION_FLAGS) to IMA_ACTION_RULE_FLAGS was done by
commit 42a4c603198f0 ("ima: fix ima_inode_post_setattr").

Restore the original change, but with new mask 0xfb000000 since the
policy-specific flags changed meanwhile, and rename IMA_ACTION_RULE_FLAGS
to IMA_NONACTION_RULE_FLAGS, to be consistent with IMA_NONACTION_FLAGS.

Cc: stable@...r.kernel.org # v4.16.x
Fixes: 11c60f23ed13 ("integrity: Remove unused macro IMA_ACTION_RULE_FLAGS")
Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
---
 security/integrity/ima/ima.h      | 1 +
 security/integrity/ima/ima_main.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 22c3b87cfcac..32ffef2cc92a 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -141,6 +141,7 @@ struct ima_kexec_hdr {
 
 /* IMA iint policy rule cache flags */
 #define IMA_NONACTION_FLAGS	0xff000000
+#define IMA_NONACTION_RULE_FLAGS	0xfb000000
 #define IMA_DIGSIG_REQUIRED	0x01000000
 #define IMA_PERMIT_DIRECTIO	0x02000000
 #define IMA_NEW_FILE		0x04000000
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 712c3a522e6c..83e467ad18d4 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -277,7 +277,7 @@ static int process_measurement(struct file *file, const struct cred *cred,
 		/* reset appraisal flags if ima_inode_post_setattr was called */
 		iint->flags &= ~(IMA_APPRAISE | IMA_APPRAISED |
 				 IMA_APPRAISE_SUBMASK | IMA_APPRAISED_SUBMASK |
-				 IMA_NONACTION_FLAGS);
+				 IMA_NONACTION_RULE_FLAGS);
 
 	/*
 	 * Re-evaulate the file if either the xattr has changed or the
-- 
2.47.0.118.gfd3785337b