Merge tag 'aa-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor into ra-next

1 files changed, 28 insertions, 16 deletions

diff --git a/security/apparmor/context.c b/security/apparmor/context.c
index 8a9b5027c813..d5af1d15f26d 100644
--- a/security/apparmor/context.c
+++ b/security/apparmor/context.c
@@ -69,6 +69,23 @@ void aa_dup_task_context(struct aa_task_cxt *new, const struct aa_task_cxt *old)
 }
 
 /**
+ * aa_get_task_profile - Get another task's profile
+ * @task: task to query  (NOT NULL)
+ *
+ * Returns: counted reference to @task's profile
+ */
+struct aa_profile *aa_get_task_profile(struct task_struct *task)
+{
+	struct aa_profile *p;
+
+	rcu_read_lock();
+	p = aa_get_profile(__aa_task_profile(task));
+	rcu_read_unlock();
+
+	return p;
+}
+
+/**
  * aa_replace_current_profile - replace the current tasks profiles
  * @profile: new profile  (NOT NULL)
  *
@@ -76,7 +93,7 @@ void aa_dup_task_context(struct aa_task_cxt *new, const struct aa_task_cxt *old)
  */
 int aa_replace_current_profile(struct aa_profile *profile)
 {
-	struct aa_task_cxt *cxt = current_cred()->security;
+	struct aa_task_cxt *cxt = current_cxt();
 	struct cred *new;
 	BUG_ON(!profile);
 
@@ -87,17 +104,13 @@ int aa_replace_current_profile(struct aa_profile *profile)
 	if (!new)
 		return -ENOMEM;
 
-	cxt = new->security;
-	if (unconfined(profile) || (cxt->profile->ns != profile->ns)) {
+	cxt = cred_cxt(new);
+	if (unconfined(profile) || (cxt->profile->ns != profile->ns))
 		/* if switching to unconfined or a different profile namespace
 		 * clear out context state
 		 */
-		aa_put_profile(cxt->previous);
-		aa_put_profile(cxt->onexec);
-		cxt->previous = NULL;
-		cxt->onexec = NULL;
-		cxt->token = 0;
-	}
+		aa_clear_task_cxt_trans(cxt);
+
 	/* be careful switching cxt->profile, when racing replacement it
 	 * is possible that cxt->profile->replacedby is the reference keeping
 	 * @profile valid, so make sure to get its reference before dropping
@@ -123,7 +136,7 @@ int aa_set_current_onexec(struct aa_profile *profile)
 	if (!new)
 		return -ENOMEM;
 
-	cxt = new->security;
+	cxt = cred_cxt(new);
 	aa_get_profile(profile);
 	aa_put_profile(cxt->onexec);
 	cxt->onexec = profile;
@@ -150,7 +163,7 @@ int aa_set_current_hat(struct aa_profile *profile, u64 token)
 		return -ENOMEM;
 	BUG_ON(!profile);
 
-	cxt = new->security;
+	cxt = cred_cxt(new);
 	if (!cxt->previous) {
 		/* transfer refcount */
 		cxt->previous = cxt->profile;
@@ -187,7 +200,7 @@ int aa_restore_previous_profile(u64 token)
 	if (!new)
 		return -ENOMEM;
 
-	cxt = new->security;
+	cxt = cred_cxt(new);
 	if (cxt->token != token) {
 		abort_creds(new);
 		return -EACCES;
@@ -205,11 +218,10 @@ int aa_restore_previous_profile(u64 token)
 		aa_get_profile(cxt->profile);
 		aa_put_profile(cxt->previous);
 	}
-	/* clear exec && prev information when restoring to previous context */
+	/* ref has been transfered so avoid putting ref in clear_task_cxt */
 	cxt->previous = NULL;
-	cxt->token = 0;
-	aa_put_profile(cxt->onexec);
-	cxt->onexec = NULL;
+	/* clear exec && prev information when restoring to previous context */
+	aa_clear_task_cxt_trans(cxt);
 
 	commit_creds(new);
 	return 0;