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

Ben Hutchings
2017-02-16T00:22:52Z

From: John Johansen <john.johansen@canonical.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After a policy replacement, the task cred may be out of date and need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the out of date cred resulting in either: a stale profile being applied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@canonical.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Ben Hutchings <ben@decadent.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;