From 20c226590b17e729511458529734675887a25c91 Mon Sep 17 00:00:00 2001
From: Pawel Wieczorkiewicz <wipawel@grsecurity.net>
Date: Mon, 6 Nov 2023 14:55:33 +0100
Subject: [PATCH] percpu: cleanup percpu page upon allocation

Signed-off-by: Pawel Wieczorkiewicz <wipawel@grsecurity.net>
---
 common/percpu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/common/percpu.c b/common/percpu.c
index f933746b..c77d0935 100644
--- a/common/percpu.c
+++ b/common/percpu.c
@@ -27,6 +27,7 @@
 #include <lib.h>
 #include <list.h>
 #include <percpu.h>
+#include <string.h>
 
 #include <mm/vmm.h>
 
@@ -51,6 +52,7 @@ percpu_t *get_percpu_page(unsigned int cpu) {
      */
     percpu = get_free_page(GFP_IDENT | GFP_KERNEL | GFP_USER);
     BUG_ON(!percpu);
+    memset(percpu, 0, PAGE_SIZE);
 
     percpu->cpu_id = cpu;