This is a note to let you know that I've just added the patch titled ima: accept previously set IMA_NEW_FILE to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ima-accept-previously-set-ima_new_file.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 1ac202e978e18f045006d75bd549612620c6ec3a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Daniel=20Gl=C3=B6ckner?= <dg@xxxxxxxxx> Date: Fri, 24 Feb 2017 15:05:14 +0100 Subject: ima: accept previously set IMA_NEW_FILE MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Daniel Glöckner <dg@xxxxxxxxx> commit 1ac202e978e18f045006d75bd549612620c6ec3a upstream. Modifying the attributes of a file makes ima_inode_post_setattr reset the IMA cache flags. So if the file, which has just been created, is opened a second time before the first file descriptor is closed, verification fails since the security.ima xattr has not been written yet. We therefore have to look at the IMA_NEW_FILE even if the file already existed. With this patch there should no longer be an error when cat tries to open testfile: $ rm -f testfile $ ( echo test >&3 ; touch testfile ; cat testfile ) 3>testfile A file being new is no reason to accept that it is missing a digital signature demanded by the policy. Signed-off-by: Daniel Glöckner <dg@xxxxxxxxx> Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- security/integrity/ima/ima_appraise.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -204,10 +204,11 @@ int ima_appraise_measurement(enum ima_ho cause = "missing-hash"; status = INTEGRITY_NOLABEL; - if (opened & FILE_CREATED) { + if (opened & FILE_CREATED) iint->flags |= IMA_NEW_FILE; + if ((iint->flags & IMA_NEW_FILE) && + !(iint->flags & IMA_DIGSIG_REQUIRED)) status = INTEGRITY_PASS; - } goto out; } Patches currently in stable-queue which might be from dg@xxxxxxxxx are queue-4.9/ima-accept-previously-set-ima_new_file.patch