From: Dmitry Kasatkin <dmitry.kasatkin@xxxxxxxxx>
Subject: vfs: increment iversion when a file is truncated
When a file is truncated with truncate()/ftruncate() and then closed,
iversion is not updated. This patch uses ATTR_SIZE flag as an indication
to increment iversion.
Mimi said:
On fput(), i_version is used to detect and flag files that have changed
and need to be re-measured in the IMA measurement policy. When a file
is truncated with truncate()/ftruncate() and then closed, i_version is
not updated. As a result, although the file has changed, it will not be
re-measured and added to the IMA measurement list on subsequent access.
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@xxxxxxxxx>
Acked-by: Mimi Zohar <zohar@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/attr.c | 5 +++++
1 file changed, 5 insertions(+)
diff -puN fs/attr.c~vfs-increment-iversion-when-a-file-is-truncated fs/attr.c
--- a/fs/attr.c~vfs-increment-iversion-when-a-file-is-truncated
+++ a/fs/attr.c
@@ -176,6 +176,11 @@ int notify_change(struct dentry * dentry
return -EPERM;
}
+ if ((ia_valid & ATTR_SIZE) && IS_I_VERSION(inode)) {
+ if (attr->ia_size != inode->i_size)
+ inode_inc_iversion(inode);
+ }
+
if ((ia_valid & ATTR_MODE)) {
umode_t amode = attr->ia_mode;
/* Flag setting protected by i_mutex */
_
--
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