linux-kernel - [PATCH v2 02/11] vfs: move ima_file

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Message-Id: <1330629048-5933-3-git-send-email-zohar@linux.vnet.ibm.com>
Date:	Thu,  1 Mar 2012 14:10:39 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	linux-security-module@...r.kernel.org
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Al Viro <viro@...IV.linux.org.uk>,
	David Safford <safford@...ux.vnet.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@...el.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: [PATCH v2 02/11] vfs: move ima_file_free before releasing the file

ima_file_free(), called on __fput(), currently flags files that have
changed, so that the file is re-measured.  For appraising a files's
integrity, flagging the file is not enough.  The file's hash must be
re-calculated and stored in the 'security.ima' xattr to reflect any
changes.

This patch moves the ima_file_free() call to before releasing the file
in preparation of ima-appraisal measuring the file and updating the
'security.ima' xattr.

Signed-off-by: Mimi Zohar <zohar@...ibm.com>
Acked-by: Serge Hallyn <serge.hallyn@...ntu.com>
---
 fs/file_table.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/file_table.c b/fs/file_table.c
index 20002e3..554161a 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -243,10 +243,10 @@ static void __fput(struct file *file)
 		if (file->f_op && file->f_op->fasync)
 			file->f_op->fasync(-1, file, 0);
 	}
+	ima_file_free(file);
 	if (file->f_op && file->f_op->release)
 		file->f_op->release(inode, file);
 	security_file_free(file);
-	ima_file_free(file);
 	if (unlikely(S_ISCHR(inode->i_mode) && inode->i_cdev != NULL &&
 		     !(file->f_mode & FMODE_PATH))) {
 		cdev_put(inode->i_cdev);
-- 
1.7.6.5

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