Commit b80bed5c871a for kernel

commit b80bed5c871a80151351342c065579405ce77145
Author: Mimi Zohar <zohar@linux.ibm.com>
Date:   Mon Jul 27 20:39:41 2026 -0400

    ima: Instantiate file_truncate and path_truncate hooks

    Instantiate the file_truncate and path_truncate LSM hooks to reset the
    action cache flags (IMA_DONE_MASK) as soon as truncation is requested,
    so the file, based on policy, is re-collected, re-measured, re-audited,
    and re-appraised on next access.

    Tested-by: Frederick Lawler <fred@cloudflare.com>
    Cc: stable@vger.kernel.org
    Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 5cea53fc36df..ff52becc3031 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -687,6 +687,43 @@ static int ima_file_check(struct file *file, int mask)
 					   MAY_APPEND), FILE_CHECK, 0, false);
 }

+/*
+ * ima_reset_action_flags - invalidate action flags after a content change
+ * @inode: inode of the file whose content is about to be truncated
+ *
+ * Clear IMA_DONE_MASK so the file is re-collected, re-measured,
+ * re-audited, and re-appraised on next access.
+ */
+static void ima_reset_action_flags(struct inode *inode)
+{
+	struct ima_iint_cache *iint;
+
+	if (!ima_policy_flag || !S_ISREG(inode->i_mode))
+		return;
+
+	iint = ima_iint_find(inode);
+	if (!iint)
+		return;
+
+	mutex_lock(&iint->mutex);
+	iint->flags &= ~IMA_DONE_MASK;
+	iint->measured_pcrs = 0;
+	mutex_unlock(&iint->mutex);
+	return;
+}
+
+static int ima_path_truncate(const struct path *path)
+{
+	ima_reset_action_flags(path->dentry->d_inode);
+	return 0;
+}
+
+static int ima_file_truncate(struct file *file)
+{
+	ima_reset_action_flags(file_inode(file));
+	return 0;
+}
+
 static int __ima_inode_hash(struct inode *inode, struct file *file, char *buf,
 			    size_t buf_size)
 {
@@ -1300,11 +1337,13 @@ static struct security_hook_list ima_hooks[] __ro_after_init = {
 	LSM_HOOK_INIT(file_release, ima_file_free),
 	LSM_HOOK_INIT(mmap_file, ima_file_mmap),
 	LSM_HOOK_INIT(file_mprotect, ima_file_mprotect),
+	LSM_HOOK_INIT(file_truncate, ima_file_truncate),
 	LSM_HOOK_INIT(kernel_load_data, ima_load_data),
 	LSM_HOOK_INIT(kernel_post_load_data, ima_post_load_data),
 	LSM_HOOK_INIT(kernel_read_file, ima_read_file),
 	LSM_HOOK_INIT(kernel_post_read_file, ima_post_read_file),
 	LSM_HOOK_INIT(path_post_mknod, ima_post_path_mknod),
+	LSM_HOOK_INIT(path_truncate, ima_path_truncate),
 #ifdef CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS
 	LSM_HOOK_INIT(key_post_create_or_update, ima_post_key_create_or_update),
 #endif