From 0dab8869adf16f425b0cbd13eef1a8df4d2823f0 Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@felloff.net>
Date: Thu, 18 Jun 2015 12:15:33 +0200
Subject: kernel: ignore memory pages with singular kernel addresses

addresses va's of 0 and -BY2PG cause trouble with some memmove()/memset()
implementations and possibly other code because of the nil pointer
and end pointers wrapping to zero.
---
 sys/src/9/port/page.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'sys/src')

diff --git a/sys/src/9/port/page.c b/sys/src/9/port/page.c
index c16044512..2b0c10eeb 100644
--- a/sys/src/9/port/page.c
+++ b/sys/src/9/port/page.c
@@ -36,6 +36,8 @@ pageinit(void)
 		for(j=0; j<pm->npage; j++){
 			memset(p, 0, sizeof *p);
 			p->pa = pm->base+j*BY2PG;
+			if(cankaddr(p->pa) && (KADDR(p->pa) == nil || KADDR(p->pa) == (void*)-BY2PG))
+				continue;
 			p->color = color;
 			color = (color+1)%NCOLOR;
 			pagechainhead(p);
-- 
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