1 files changed, 23 insertions, 1 deletions

diff --git a/security/dummy.c b/security/dummy.c
index f50c6c3c32c9..b8916883b77f 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -27,6 +27,8 @@
 #include <linux/hugetlb.h>
 #include <linux/ptrace.h>
 #include <linux/file.h>
+#include <linux/prctl.h>
+#include <linux/securebits.h>
 
 static int dummy_ptrace (struct task_struct *parent, struct task_struct *child)
 {
@@ -607,7 +609,27 @@ static int dummy_task_kill (struct task_struct *p, struct siginfo *info,
 static int dummy_task_prctl (int option, unsigned long arg2, unsigned long arg3,
                              unsigned long arg4, unsigned long arg5, long *rc_p)
 {
-        return 0;
+        switch (option) {
+        case PR_CAPBSET_READ:
+                *rc_p = (cap_valid(arg2) ? 1 : -EINVAL);
+                break;
+        case PR_GET_KEEPCAPS:
+                *rc_p = issecure(SECURE_KEEP_CAPS);
+                break;
+        case PR_SET_KEEPCAPS:
+                if (arg2 > 1)
+                        *rc_p = -EINVAL;
+                else if (arg2)
+                        current->securebits |= issecure_mask(SECURE_KEEP_CAPS);
+                else
+                        current->securebits &=
+                                ~issecure_mask(SECURE_KEEP_CAPS);
+                break;
+        default:
+                return 0;
+        }
+
+        return 1;
 }
 
 static void dummy_task_reparent_to_init (struct task_struct *p)