From: Anton Blanchard <anton@samba.org>
Date: Tue, 6 Sep 2005 02:05:26 +0000 (+1000)
Subject: [PATCH] ppc64: poison initmem
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4721e2214b5fd6eca48caea76afb1bad3148930f;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[PATCH] ppc64: poison initmem

Poison initmem after we free it so we catch use after free issues.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---

diff --git a/arch/ppc64/mm/init.c b/arch/ppc64/mm/init.c
index b3b1e9c1770a..a14ab87df491 100644
--- a/arch/ppc64/mm/init.c
+++ b/arch/ppc64/mm/init.c
@@ -392,6 +392,7 @@ void free_initmem(void)
 
 	addr = (unsigned long)__init_begin;
 	for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
+		memset((void *)addr, 0xcc, PAGE_SIZE);
 		ClearPageReserved(virt_to_page(addr));
 		set_page_count(virt_to_page(addr), 1);
 		free_page(addr);