| From 799243a389bde0de10fa21ca1ca453d2fe538b85 Mon Sep 17 00:00:00 2001 |
| From: Dmitry Kasatkin <dmitry.kasatkin@intel.com> |
| Date: Tue, 29 May 2012 11:02:21 -0700 |
| Subject: vfs: increment iversion when a file is truncated |
| |
| From: Dmitry Kasatkin <dmitry.kasatkin@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.kasatkin@intel.com> |
| Acked-by: Mimi Zohar <zohar@us.ibm.com> |
| Cc: Al Viro <viro@zeniv.linux.org.uk> |
| Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
| Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| fs/attr.c | 5 +++++ |
| 1 file changed, 5 insertions(+) |
| |
| --- a/fs/attr.c |
| +++ b/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 */ |
