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yaml --- r: 139708 b: refs/heads/master c: 6dda81f h: refs/heads/master v: v3
git-mirror · Apr 3, 2009 · b4ad27a · b4ad27a
1 parent 904ee6f
commit b4ad27a
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Showing 2 changed files with 6 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8e654fba4a376f436bdfe361fc5cdbc87ac09b35
+refs/heads/master: 6dda81f4384b94930826eded254d8c16f89a9248
diff --git a/trunk/include/linux/sched.h b/trunk/include/linux/sched.h
@@ -1489,6 +1489,11 @@ static inline struct pid *task_tgid(struct task_struct *task)
 	return task->group_leader->pids[PIDTYPE_PID].pid;
 }
 
+/*
+ * Without tasklist or rcu lock it is not safe to dereference
+ * the result of task_pgrp/task_session even if task == current,
+ * we can race with another thread doing sys_setsid/sys_setpgid.
+ */
 static inline struct pid *task_pgrp(struct task_struct *task)
 {
 	return task->group_leader->pids[PIDTYPE_PGID].pid;