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authorDmitry Kasatkin <dmitry.kasatkin@intel.com>2012-05-29 11:02:21 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-06-10 00:36:12 +0900
commitc8c0b91569f01d7713c843245c538b51f733646a (patch)
treec4af2b9289b3b063a0098f406c5ff97db1d07020 /fs
parent15de0eade174f9aade57a4080f1bac1a36e45e83 (diff)
vfs: increment iversion when a file is truncated
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/attr.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/attr.c b/fs/attr.c
index 73f69a6ce9ed..d94d1b63c633 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -176,6 +176,11 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
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 */