From: Dmitry Kasatkin <[email protected]> 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 <[email protected]> Acked-by: Mimi Zohar <[email protected]> Cc: Al Viro <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> --- 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 @@ -183,6 +183,11 @@ int notify_change(struct dentry * dentry inode_inc_iversion(inode); } + 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 */ _ -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
