[PATCH 2/3] ima: update the file measurement on truncate

[Janne Karhunen]

Let IMA know when a file is being opened with truncate
or truncated directly.

Depends on commit 72649b7862a7 ("ima: keep the integrity state of open files up to date")'

Signed-off-by: Janne Karhunen <janne.karhunen at gmail.com>
Signed-off-by: Konsta Karsisto <konsta.karsisto at gmail.com>
---
 fs/namei.c | 5 ++++-
 fs/open.c  | 3 +++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/namei.c b/fs/namei.c
index 209c51a5226c..0994fe26bef1 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3418,8 +3418,11 @@ static int do_last(struct nameidata *nd,
 		goto out;
 opened:
 	error = ima_file_check(file, op->acc_mode);
-	if (!error && will_truncate)
+	if (!error && will_truncate) {
 		error = handle_truncate(file);
+		if (!error)
+			ima_file_update(file);
+	}
 out:
 	if (unlikely(error > 0)) {
 		WARN_ON(1);
diff --git a/fs/open.c b/fs/open.c
index a59abe3c669a..98c2d4629371 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -63,6 +63,9 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
 	/* Note any delegations or leases have already been broken: */
 	ret = notify_change(dentry, &newattrs, NULL);
 	inode_unlock(dentry->d_inode);
+
+	if (filp)
+		ima_file_update(filp);
 	return ret;
 }
 
-- 
2.17.1