FAILED: patch "[PATCH] ima: Reset IMA_NONACTION_RULE_FLAGS after post_setattr" failed to apply to 6.6-stable tree

PATCH In review [email protected] 3 participants 3 messages Mar 4, 2025 – Mar 6, 2025

Subsystems (4)

Stable branch Security (LSM) Integrity measurement architecture (IMA) Extended Verification Module (EVM)

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lore

[email protected]

author maintainer

2025-03-04 16:42 UTC #0 lore raw

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 57a0ef02fefafc4b9603e33a18b669ba5ce59ba3
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2025030435-perm-thesis-21fc@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 57a0ef02fefafc4b9603e33a18b669ba5ce59ba3 Mon Sep 17 00:00:00 2001
From: Roberto Sassu <[email protected]>
Date: Tue, 4 Feb 2025 13:57:20 +0100
Subject: [PATCH] ima: Reset IMA_NONACTION_RULE_FLAGS after post_setattr

Commit 0d73a55208e9 ("ima: re-introduce own integrity cache lock") mistakenly reverted the performance improvement introduced in commit 42a4c603198f0 ("ima: fix ima_inode_post_setattr"). The unused bit mask was subsequently removed by commit 11c60f23ed13 ("integrity: Remove unused macro IMA_ACTION_RULE_FLAGS").

Restore the performance improvement by introducing the new mask IMA_NONACTION_RULE_FLAGS, equal to IMA_NONACTION_FLAGS without IMA_NEW_FILE, which is not a rule-specific flag.

Finally, reset IMA_NONACTION_RULE_FLAGS instead of IMA_NONACTION_FLAGS in process_measurement(), if the IMA_CHANGE_ATTR atomic flag is set (after file metadata modification).

With this patch, new files for which metadata were modified while they are still open, can be reopened before the last file close (when security.ima is written), since the IMA_NEW_FILE flag is not cleared anymore. Otherwise, appraisal fails because security.ima is missing (files with IMA_NEW_FILE set are an exception).

Cc [email protected] # v4.16.x

Fixes 0d73a55208e9 ("ima: re-introduce own integrity cache lock")

Signed-off-by Roberto Sassu <[email protected]>

Signed-off-by Mimi Zohar <[email protected]>

security/integrity/ima/ima.h +3 -0

index 24d09ea91b87..a4f284bd846c 100644
@@ -149,6 +149,9 @@ struct ima_kexec_hdr {
 #define IMA_CHECK_BLACKLIST	0x40000000
 #define IMA_VERITY_REQUIRED	0x80000000
 
+/* Exclude non-action flags which are not rule-specific. */
+#define IMA_NONACTION_RULE_FLAGS	(IMA_NONACTION_FLAGS & ~IMA_NEW_FILE)
+
 #define IMA_DO_MASK		(IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
 				 IMA_HASH | IMA_APPRAISE_SUBMASK)
 #define IMA_DONE_MASK		(IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \

security/integrity/ima/ima_main.c +5 -2

index f2c9affa0c2a..28b8b0db6f9b 100644
@@ -269,10 +269,13 @@ static int process_measurement(struct file *file, const struct cred *cred,
 	mutex_lock(&iint->mutex);
 
 	if (test_and_clear_bit(IMA_CHANGE_ATTR, &iint->atomic_flags))
-		/* reset appraisal flags if ima_inode_post_setattr was called */
+		/*
+		 * Reset appraisal flags (action and non-action rule-specific)
+		 * 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

Mimi Zohar

maintainer

2025-03-06 02:28 UTC #1 lore raw

PATCH 1/1 ima: Reset IMA_NONACTION_RULE_FLAGS after post_setattr

From: Roberto Sassu <[email protected]>

Restore the performance improvement by introducing the new mask IMA_NONACTION_RULE_FLAGS, equal to IMA_NONACTION_FLAGS without IMA_NEW_FILE, which is not a rule-specific flag.

Finally, reset IMA_NONACTION_RULE_FLAGS instead of IMA_NONACTION_FLAGS in process_measurement(), if the IMA_CHANGE_ATTR atomic flag is set (after file metadata modification).

Cc [email protected] # v4.16.x

Fixes 0d73a55208e9 ("ima: re-introduce own integrity cache lock")

Signed-off-by Roberto Sassu <[email protected]>

Signed-off-by Mimi Zohar <[email protected]>

(cherry picked from commit 57a0ef02fefafc4b9603e33a18b669ba5ce59ba3)

---
 security/integrity/ima/ima_main.c | 7 +++++--
 security/integrity/integrity.h    | 3 +++
 2 files changed, 8 insertions(+), 2 deletions(-)

security/integrity/ima/ima_main.c +5 -2

index cc1217ac2c6f..98308a2bdef6 100644
@@ -267,10 +267,13 @@ static int process_measurement(struct file *file, const struct cred *cred,
 	mutex_lock(&iint->mutex);
 
 	if (test_and_clear_bit(IMA_CHANGE_ATTR, &iint->atomic_flags))
-		/* reset appraisal flags if ima_inode_post_setattr was called */
+		/*
+		 * Reset appraisal flags (action and non-action rule-specific)
+		 * 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

security/integrity/integrity.h +3 -0

index 9561db7cf6b4..ad20ff7f5dfa 100644
@@ -42,6 +42,9 @@
 #define IMA_CHECK_BLACKLIST	0x40000000
 #define IMA_VERITY_REQUIRED	0x80000000
 
+/* Exclude non-action flags which are not rule-specific. */
+#define IMA_NONACTION_RULE_FLAGS	(IMA_NONACTION_FLAGS & ~IMA_NEW_FILE)
+
 #define IMA_DO_MASK		(IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
 				 IMA_HASH | IMA_APPRAISE_SUBMASK)
 #define IMA_DONE_MASK		(IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \

Signature · 1 line

2.48.1

Sasha Levin

maintainer

2025-03-06 19:11 UTC #2 lore raw

Re: [PATCH 6.6.y] ima: Reset IMA_NONACTION_RULE_FLAGS after post_setattr

[ Sasha's backport helper bot ]

Hi,

Summary of potential issues:
⚠️ Found matching upstream commit but patch is missing proper reference to it

Found matching upstream commit: 57a0ef02fefafc4b9603e33a18b669ba5ce59ba3

WARNING: Author mismatch between patch and found commit:
Backport author: Mimi Zohar<[email protected]> Commit author: Roberto Sassu<[email protected]>

Note: The patch differs from the upstream commit:
---
1: 57a0ef02fefaf ! 1: 6f8f39f341145 ima: Reset IMA_NONACTION_RULE_FLAGS after post_setattr
@@ Commit message

Fixes 0d73a55208e9 ("ima: re-introduce own integrity cache lock")

Signed-off-by Roberto Sassu <[email protected]>

Signed-off-by Mimi Zohar <[email protected]>

-
- ## security/integrity/ima/ima.h ##
-@@ security/integrity/ima/ima.h: struct ima_kexec_hdr {
- #define IMA_CHECK_BLACKLIST 0x40000000
- #define IMA_VERITY_REQUIRED 0x80000000
-
-+/* Exclude non-action flags which are not rule-specific. */
-+#define IMA_NONACTION_RULE_FLAGS (IMA_NONACTION_FLAGS & ~IMA_NEW_FILE)
-+
- #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
- IMA_HASH | IMA_APPRAISE_SUBMASK)
- #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
+ (cherry picked from commit 57a0ef02fefafc4b9603e33a18b669ba5ce59ba3)

## security/integrity/ima/ima_main.c ##
@@ security/integrity/ima/ima_main.c: static int process_measurement(struct file *file, const struct cred *cred,
@@ security/integrity/ima/ima_main.c: static int process_measurement(struct file *f

/*
* Re-evaulate the file if either the xattr has changed or the
+
+ ## security/integrity/integrity.h ##
+@@
+ #define IMA_CHECK_BLACKLIST 0x40000000
+ #define IMA_VERITY_REQUIRED 0x80000000
+
++/* Exclude non-action flags which are not rule-specific. */
++#define IMA_NONACTION_RULE_FLAGS (IMA_NONACTION_FLAGS & ~IMA_NEW_FILE)
++
+ #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
+ IMA_HASH | IMA_APPRAISE_SUBMASK)
+ #define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.6.y        |  Success    |  Success   |