linux-kernel - [PATCH 3.12 17/38] apparmor: fix change_hat not finding hat after policy replacement

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Message-Id: <6d7bc8a89e1303bde5647d6940c36a43dcf4bc68.1481658746.git.jslaby@suse.cz>
Date:   Tue, 13 Dec 2016 20:52:43 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        John Johansen <john.johansen@...onical.com>,
        James Morris <james.l.morris@...cle.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 17/38] apparmor: fix change_hat not finding hat after policy replacement

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

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After a policy replacement, the task cred may be out of date and need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the out of date cred resulting in either: a stale profile being applied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: Jiri Slaby <jslaby@...e.cz>
---
 security/apparmor/domain.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c
index 26c607c971f5..0c23888b9816 100644
--- a/security/apparmor/domain.c
+++ b/security/apparmor/domain.c
@@ -629,8 +629,8 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
 	/* 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";
@@ -726,6 +726,8 @@ audit:
 out:
 	aa_put_profile(hat);
 	kfree(name);
+	aa_put_profile(profile);
+	aa_put_profile(previous_profile);
 	put_cred(cred);
 
 	return error;
-- 
2.11.0