kernel: Add the ability to manually elevate privileges for programs using prctl by specifying UID or PID.

kernel/manual_su.h

@@ -0,0 +1,22 @@
+#ifndef __KSU_MANUAL_SU_H
+#define __KSU_MANUAL_SU_H
+
+#include <linux/types.h>
+#include <linux/sched.h>
+
+#define KSU_SU_VERIFIED_BIT (1UL << 0)
+
+static inline bool ksu_is_current_verified(void)
+{
+    return ((unsigned long)(current->security) & KSU_SU_VERIFIED_BIT) != 0;
+}
+
+static inline void ksu_mark_current_verified(void)
+{
+    current->security = (void *)((unsigned long)(current->security) | KSU_SU_VERIFIED_BIT);
+}
+
+int ksu_manual_su_escalate(uid_t target_uid, pid_t target_pid,
+                           const char __user *user_password);
+
+#endif