linux-kernel - Re: [PATCH 1/1] x86: fix text

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20080425164259.GA19962@elte.hu>
Date:	Fri, 25 Apr 2008 18:43:00 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Jiri Slaby <jirislaby@...il.com>,
	David Miller <davem@...emloft.net>, zdenek.kabelac@...il.com,
	rjw@...k.pl, paulmck@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
	linux-ext4@...r.kernel.org, herbert@...dor.apana.org.au,
	penberg@...helsinki.fi, clameter@....com,
	linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	pageexec@...email.hu, "H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCH 1/1] x86: fix text_poke


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Fri, 25 Apr 2008, Ingo Molnar wrote:
> > 
> > hm, right now we've got a debug protection in set_fixmap() to make 
> > sure it's only ever called once. So it's going to be a noisy bootup. 
> > (but it's a warning only) The patch below removes that.
> 
> No, I think the warning is good, I should have done some kind of 
> clear_fixmap() after doing the mmap.

yeah - then you need the patch below that makes clear_fixmap() available 
on 64-bit as well.

	Ingo

--------------->
Subject: x86: make clear_fixmap() available on 64-bit as well
From: Ingo Molnar <mingo@...e.hu>
Date: Fri Apr 25 18:25:25 CEST 2008

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 include/asm-x86/fixmap.h    |    8 ++++++++
 include/asm-x86/fixmap_32.h |    7 ++-----
 include/asm-x86/fixmap_64.h |    4 ++--
 3 files changed, 12 insertions(+), 7 deletions(-)

Index: linux/include/asm-x86/fixmap.h
===================================================================
--- linux.orig/include/asm-x86/fixmap.h
+++ linux/include/asm-x86/fixmap.h
@@ -1,5 +1,13 @@
+#ifndef _ASM_FIXMAP_H
+#define _ASM_FIXMAP_H
+
 #ifdef CONFIG_X86_32
 # include "fixmap_32.h"
 #else
 # include "fixmap_64.h"
 #endif
+
+#define clear_fixmap(idx)			\
+	__set_fixmap(idx, 0, __pgprot(0))
+
+#endif
Index: linux/include/asm-x86/fixmap_32.h
===================================================================
--- linux.orig/include/asm-x86/fixmap_32.h
+++ linux/include/asm-x86/fixmap_32.h
@@ -10,8 +10,8 @@
  * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
  */
 
-#ifndef _ASM_FIXMAP_H
-#define _ASM_FIXMAP_H
+#ifndef _ASM_FIXMAP_32_H
+#define _ASM_FIXMAP_32_H
 
 
 /* used by vmalloc.c, vsyscall.lds.S.
@@ -121,9 +121,6 @@ extern void reserve_top_address(unsigned
 #define set_fixmap_nocache(idx, phys)			\
 	__set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
 
-#define clear_fixmap(idx)			\
-	__set_fixmap(idx, 0, __pgprot(0))
-
 #define FIXADDR_TOP	((unsigned long)__FIXADDR_TOP)
 
 #define __FIXADDR_SIZE	(__end_of_permanent_fixed_addresses << PAGE_SHIFT)
Index: linux/include/asm-x86/fixmap_64.h
===================================================================
--- linux.orig/include/asm-x86/fixmap_64.h
+++ linux/include/asm-x86/fixmap_64.h
@@ -8,8 +8,8 @@
  * Copyright (C) 1998 Ingo Molnar
  */
 
-#ifndef _ASM_FIXMAP_H
-#define _ASM_FIXMAP_H
+#ifndef _ASM_FIXMAP_64_H
+#define _ASM_FIXMAP_64_H
 
 #include <linux/kernel.h>
 #include <asm/apicdef.h>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/