Patch "ima: do not update security.ima if appraisal status is not INTEGRITY_PASS" has been added to the 4.14-stable tree

Patch "ima: do not update security.ima if appraisal status is not INTEGRITY_PASS" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ima: do not update security.ima if appraisal status is not INTEGRITY_PASS

to the 4.14-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-do-not-update-security.ima-if-appraisal-status-is-not-integrity_pass.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 020aae3ee58c1af0e7ffc4e2cc9fe4dc630338cb Mon Sep 17 00:00:00 2001
From: Roberto Sassu <roberto.sassu@huawei.com>
Date: Tue, 7 Nov 2017 11:37:07 +0100
Subject: ima: do not update security.ima if appraisal status is not INTEGRITY_PASS

From: Roberto Sassu <roberto.sassu@huawei.com>

commit 020aae3ee58c1af0e7ffc4e2cc9fe4dc630338cb upstream.

Commit b65a9cfc2c38 ("Untangling ima mess, part 2: deal with counters")
moved the call of ima_file_check() from may_open() to do_filp_open() at a
point where the file descriptor is already opened.

This breaks the assumption made by IMA that file descriptors being closed
belong to files whose access was granted by ima_file_check(). The
consequence is that security.ima and security.evm are updated with good
values, regardless of the current appraisal status.

For example, if a file does not have security.ima, IMA will create it after
opening the file for writing, even if access is denied. Access to the file
will be allowed afterwards.

Avoid this issue by checking the appraisal status before updating
security.ima.

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 security/integrity/ima/ima_appraise.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -320,6 +320,9 @@ void ima_update_xattr(struct integrity_i
 	if (iint->flags & IMA_DIGSIG)
 		return;
 
+	if (iint->ima_file_status != INTEGRITY_PASS)
+		return;
+
 	rc = ima_collect_measurement(iint, file, NULL, 0, ima_hash_algo);
 	if (rc < 0)
 		return;


Patches currently in stable-queue which might be from roberto.sassu@huawei.com are

queue-4.14/ima-do-not-update-security.ima-if-appraisal-status-is-not-integrity_pass.patch