3.2-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dmitry Kasatkin <dmitry.kasat...@intel.com>
commit 799243a389bde0de10fa21ca1ca453d2fe538b85 upstream.
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.kasat...@intel.com>
Acked-by: Mimi Zohar <zo...@us.ibm.com>
Cc: Al Viro <v...@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Al Viro <v...@zeniv.linux.org.uk>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
fs/attr.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -176,6 +176,11 @@
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)) {
mode_t amode = attr->ia_mode;
/* Flag setting protected by i_mutex */
--
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