FAILED: patch "[PATCH] ima: limit the number of open-writers integrity violations" failed to apply to 6.6-stable tree

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 5b3cd801155f0b34b0b95942a5b057c9b8cad33e
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2025041724-puritan-pointer-517f@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

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

From 5b3cd801155f0b34b0b95942a5b057c9b8cad33e Mon Sep 17 00:00:00 2001
From: Mimi Zohar <[email protected]>
Date: Mon, 27 Jan 2025 10:24:13 -0500
Subject: [PATCH] ima: limit the number of open-writers integrity violations

Each time a file in policy, that is already opened for write, is opened for read, an open-writers integrity violation audit message is emitted and a violation record is added to the IMA measurement list. This occurs even if an open-writers violation has already been recorded.

Limit the number of open-writers integrity violations for an existing file open for write to one. After the existing file open for write closes (__fput), subsequent open-writers integrity violations may be emitted.

index a4f284bd846c..3423b3088de5 100644
@@ -182,6 +182,7 @@ struct ima_kexec_hdr {
 #define IMA_CHANGE_ATTR		2
 #define IMA_DIGSIG		3
 #define IMA_MUST_MEASURE	4
+#define IMA_EMITTED_OPENWRITERS	5
 
 /* IMA integrity metadata associated with an inode */
 struct ima_iint_cache {

index 28b8b0db6f9b..95118c1887cb 100644
@@ -137,8 +137,13 @@ static void ima_rdwr_violation_check(struct file *file,
 	} else {
 		if (must_measure)
 			set_bit(IMA_MUST_MEASURE, &iint->atomic_flags);
-		if (inode_is_open_for_write(inode) && must_measure)
-			send_writers = true;
+
+		/* Limit number of open_writers violations */
+		if (inode_is_open_for_write(inode) && must_measure) {
+			if (!test_and_set_bit(IMA_EMITTED_OPENWRITERS,
+					      &iint->atomic_flags))
+				send_writers = true;
+		}
 	}
 
 	if (!send_tomtou && !send_writers)

@@ -167,6 +172,8 @@ static void ima_check_last_writer(struct ima_iint_cache *iint,
 	if (atomic_read(&inode->i_writecount) == 1) {
 		struct kstat stat;
 
+		clear_bit(IMA_EMITTED_OPENWRITERS, &iint->atomic_flags);
+
 		update = test_and_clear_bit(IMA_UPDATE_XATTR,
 					    &iint->atomic_flags);
 		if ((iint->flags & IMA_NEW_FILE) ||