linux-kernel - [PATCH 3.16 255/306] apparmor: fix change_hat not finding hat after policy replacement

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Message-ID: <lsq.1487198500.828782171@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:40 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "John Johansen" <john.johansen@...onical.com>,
        "James Morris" <james.l.morris@...cle.com>
Subject: [PATCH 3.16 255/306] apparmor: fix change_hat not finding hat
 after policy replacement

3.16.40-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: John Johansen <john.johansen@...onical.com>

commit 3d40658c977769ce2138f286cf131537bf68bdfe upstream.

After a policy replacement, the task cred may be out of date and need
to be updated. However change_hat is using the stale profiles from
the out of date cred resulting in either: a stale profile being applied
or, incorrect failure when searching for a hat profile as it has been
migrated to the new parent profile.

Fixes: 01e2b670aa898a39259bc85c78e3d74820f4d3b6 (failure to find hat)
Fixes: 898127c34ec03291c86f4ff3856d79e9e18952bc (stale policy being applied)
Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=1000287
Signed-off-by: John Johansen <john.johansen@...onical.com>
Signed-off-by: James Morris <james.l.morris@...cle.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 security/apparmor/domain.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/security/apparmor/domain.c
+++ b/security/apparmor/domain.c
@@ -627,8 +627,8 @@ int aa_change_hat(const char *hats[], in
 	/* released below */
 	cred = get_current_cred();
 	cxt = cred_cxt(cred);
-	profile = aa_cred_profile(cred);
-	previous_profile = cxt->previous;
+	profile = aa_get_newest_profile(aa_cred_profile(cred));
+	previous_profile = aa_get_newest_profile(cxt->previous);
 
 	if (unconfined(profile)) {
 		info = "unconfined";
@@ -724,6 +724,8 @@ audit:
 out:
 	aa_put_profile(hat);
 	kfree(name);
+	aa_put_profile(profile);
+	aa_put_profile(previous_profile);
 	put_cred(cred);
 
 	return error;